Observation of neutrinoless double-beta decay (0$\nu\beta^{-}\beta^{-}$) would establish that neutrinos are Majorana particles (indistinguishable from their antiparticles) [1]. In spite of the formidable experimental challenges, it is an experimentally sensitive avenue to provide direct information on neutrino masses. The current work [2] would explore the required sensitivity for the upcoming...
Identification of electron neutrino interactions in liquid argon time projection chambers is essential to seeking answers to questions of the fundamental nature of neutrinos. These analyses include determining the ordering of the mass states and the value of the CP-violating phase in the neutrino sector in the Deep Underground Neutrino Experiment (DUNE), and performing neutrino oscillation...
In many rare event searches noble gases are deployed as detector target. In order to achieve higher sensitivities, purification systems ensure a low number of impurities by continuous circulating. To pump and compress xenon gas through such systems an ultra-clean, hermetically sealed, radon-free pump without oil lubrication is indispensable. Considering that the detectors of low background...
An ongoing analysis in IceCube regarding high-energy sterile neutrino oscillations is discussed. Matter-enhanced resonances for eV-scale sterile neutrinos with non-zero $\theta_{24}$ and $\theta_{34}$ lead to a strong enhancement of cascade-like event signatures through $\nu_{\mu}\to\nu_{s}\to\nu_{\tau}$ oscillations and allow for a direct $\nu_{\tau}$ appearance probe. Similar channels also...
We reconsider kinetically mixed dark photons as an explanation of the $(g-2)_\mu$ anomaly. While fully visible and invisible dark photon decays are excluded, a semi-visible solution can still explain the discrepancy. We explicitly re-evaluate the constraints from B-factories and fixed-target experiments, namely BaBar and NA64, pointing to a solution in terms of dark sector models with dark...
We propose a new approach to explore the neutral-current non-standard neutrino interactions (NSI) in atmospheric neutrino experiments using oscillation dips and valleys in reconstructed muon observables, at a detector like ICAL that can identify the muon charge. We focus on the flavor-changing NSI parameter $\varepsilon_{\mu\tau}$, which has the maximum impact on the muon survival probability...
Based on the IsoDAR 60 MeV/amu compact cyclotron design, which introduces several novel ideas for this type of particle accelerator, we describe a new family of high-current cyclotrons with energy from 1 to 60 MeV as a tool for particle physics, isotope production, and other uses. The design is modular, with design features upstream of 1 MeV identical for any energy and easily customized...
Photomultiplier tubes (PMTs) are widely used in scintillation and Cherenkov detectors for their great performances on photon detection. For example, the Jiangmen Underground Neutrino Observatory (JUNO) will use 17,612 20-inch PMTs in its central detector to achieve an unprecedented energy resolution of 3%/√𝐸. It’s critical to construct a reliable and accurate optical model to describe the...
An accurate atmospheric neutrino flux is crucial for a multitude of physics studies with the modern neutrino telescopes; as a signal for neutrino oscillation measurements, and as a background for searches of astrophysical neutrino sources. For precision calculations at energies below a few GeV, which are within reach of the IceCube Upgrade and KM3NeT-ORCA, the lateral component of hadronic...
We continue our discussions [1-5] about the electromagnetic properties of neutrinos and present an updated review on this topic. We start with a short introduction to the derivation of the general structure of the electromagnetic form factors of Dirac and Majorana neutrinos.
Then we consider experimental constraints on neutrino magnetic and electric dipole moments, electric millicharge,...
We discuss a new experiment based on the proposal [1] to observe for the first time the coherent elastic neutrino-atom scattering (CEνAS), using electron antineutrinos from tritium decay and a liquid He-4 target, and also to search neutrino electromagnetic properties [2,3], including the neutrino magnetic moment. The experiment is under preparation within the research program of the National...
BGO scintillator is widely used in particle physics experiments. It is also used in Super-Kamiokande to evaluate the efficiency of neutron tagging which can select electron antineutrino events via inverse beta decay process. A relative 10% discrepancy between the measured and simulated efficiency of neutron tagging was reported as systematic errors. A precise measurement of responses of the...
Icecube neutrino detector in last decade recorded an abundant noisy atmospheric rain of upward, contained, muon track neutrinos, up to TeVs energy. Their overabundance over electron atmospheric showers or cascade ones, had been well tested. Above tens TeV energy, the sudden overcome of shower or cascades rain, even within PeV energy (2013), the high energy starting events, HESE, more abundant...
Several anomalies over the last two decades point towards the existence of eV-scale sterile neutrino. In this work, we study the physics potential of two proposed long-baseline experimental set-ups in the presence of a light sterile neutrino, over a wide range of $\Delta m^2_{41}$ from $10^{-5}$ eV$^{2}$ to 10$^2$ eV$^2$. The first set-up consists of two Far Detectors (FD), namely Japanese...
During the modern era of high precision neutrino physics measurements it has become increasingly important to deepen our understanding
of detector performance. It is common for neutrino detector systems to
be fully or partially composed of polystyrene-based scintillator bars, and
most experiments now gather data for over a decade. Therefore it is crucial to investigate how the performance...
The KATRIN experiment aims to measure the neutrino mass via precision spectroscopy of the kinetic energy spectrum of tritium beta-decay with a target sensitivity of 0.2 eV/c² at 90% C.L. A high intensity windowless gaseous tritium source is used in conjunction with a high-resolution spectrometer applying the magnetic adiabatic collimation (MAC-E filter) technique to scan the beta-decay...
We find compact analytical expressions for neutrino oscillation probabilities, with invisible neutrino decay and matter effects included in 2-flavor and 3-flavor formalisms. The decay may be represented by an effective Hamiltonian which is non-Hermitian. The Hermitian and the anti-Hermitian components of this Hamiltonian need not commute; in the presence of matter, these components invariably...
This poster will present the sensitivity towards the detection of low-energy antineutrinos of the Theia detector. For the purposes of this study, we consider one of the possible proposed designs, a 25-ktonne Theia-25 detector filled with a water-based liquid scintillator (WbLS) placed at Sanford Underground Research Facility (SURF). Currently, only two detectors in the world have measured...
An accurate determination of the neutrino flux produced by the Neutrinos at the Main Injector (NuMI) and the Long-Baseline Neutrino Facility (LBNF) beamlines is essential to the neutrino oscillation and neutrino interaction measurements for the Fermilab neutrino experiments, such as MINERvA, NOvA, and the upcoming DUNE. In the current flux predictions, we use the Package to Predict the FluX...
In the IceCube South Pole Neutrino Observatory, looking at well reconstructed track events from the southern sky results in an event sample filled with atmospheric muons and neutrinos created in cosmic ray air showers that dominate over a signal of astrophysical neutrinos. However, selecting from these events tracks that start inside the detector allows you to not only reject the muon...
A joint oscillation analysis of atmospheric neutrinos at Super-Kamiokande (SK) and accelerator neutrinos at Tokai-to-Kamioka (T2K) is in preparation. The atmospheric oscillation probability calculation is one of the most time-consuming parts of the fit and demands precision due to direct impact on oscillation parameter constraints. As an alternative to the existing method of pre-computing...
The Project 8 experiment aims to make a direct measurement sensitive to much of the unexplored range of neutrino masses. Past experiments used molecular tritium, which has a large energy smearing from its final states. Project 8 will use atomic tritium to reach a design sensitivity of $m_\beta\mbox{}\leq\mbox{}40\mbox{ }$meV. This requires $\mathcal{O}(10^{20})$ tritium atoms held at tens of...
The goal of the KATRIN experiment is to measure the absolute mass of neutrinos with an unprecedented sensitivity of 0.2 eV/c².
To achieve this, understanding the background processes is of great importance. Currently, the background level exceeds the estimated design value by a factor of 15.
It is hypothesised that most of the measured background events originate from ionised Rydberg states...
The MAJORANA DEMONSTRATOR is a neutrinoless double-beta decay experiment located at the Sanford Underground Research Facility (SURF) in Lead, South Dakota. The DEMONSTRATOR contains an array of 44 kg of Ge detectors, of which 30 kg are enriched in the neutrinoless double-beta decay candidate isotope $^{76}$Ge. From the initial 26 kg yrs of exposure, the count rate in the background estimation...
We present Beyond-the-Standard-Model (BSM) physics searches accessible to LEGEND-1000, a future neutrinoless double-beta decay (0νββ) experiment with the goal of 10 ton-years exposure. LEGEND-1000 will comprise a ton of High-purity Germanium detectors, enriched to more than 90% in $^{76}$Ge, surrounded by a 300 t of liquid argon (LAr) instrumented as an active radiation shield.
With its...
The present global analyses of the oscillation data do not agree on the octant in which the best-fit value of $\theta_{23}$ lies. Further, they allow $\sin^{2}\theta_{23}=0.5$ at 3$\sigma$ confidence level. Hence, it is imperative to question at what confidence level maximal 2-3 mixing can be ruled out. We study in detail the performance of DUNE to establish the deviation from maximal...
We present the status of the development of a Cherenkov telescope to be flown on an ultra-long-duration balloon flight, the Extreme Universe Space Observatory Super Pressure Balloon 2 (EUSO-SPB2). EUSO-SPB2 is an approved NASA balloon mission that is planned to fly in 2023 from Wanaka, New Zealand and is a precursor for future space-based missions to detect astrophysical neutrinos. The...
SuperNEMO is a neutrinoless double beta decay (0$\nu\beta\beta$) experiment, whose demonstrator module is located under the Frejus mountain in Modane, France, below 4800 m.w.e. It uses a unique technology combining a tracker and a calorimeter that allows it to unambiguously identify the two individual double-beta electrons, measure each particle's energy and their angular correlation. It aims...
Dark matter (DM) direct detection experiments are entering the multiple-ton era and will be sensitive to the coherent elastic neutrino nucleus scattering (CE$\nu$NS) of solar neutrinos, enabling the possibility to explore contributions from new physics with light mediators at the low energy range. In this paper we consider light mediator models (scalar, vector and axial vector) and the...
Heavy neutral leptons (HNL) are SM-gauge-singlet fermions that mix with active neutrinos. We argue that beam-dump and other limits on these mixings $U$ cannot be directly applied to HNLs that interact with a light SM-gauge-singlet scalar $s$ which mixes with the Higgs boson. We reinterpret the limits from the DELPHI, Belle, and CHARM experiments taking into account the new decay channel $N\to...
Here we are analysing the data from Borexino phase II and constraining some non standard models. Specially, for neutrino magnetic moment, new scalars, vector bosons and NSI.
Our knowledge about 3$\nu$ mixing angles and the CP-phase are becoming more accurate day-by-day. In this high-precision era of neutrino oscillation, it is inevitable to investigate the unitarity of the 3$\nu$ mixing matrix. In this work, we study the impact of possible non-unitary neutrino mixing (NUNM) in the context of next-generation long-baseline experiments DUNE and T2HKK having one...
It is well known that the neutrino medium, such as the cosmic neutrino background, produces a tiny birefringence effect on electromagnetic waves. Recently, it was claimed that this effect may be enhanced by an additional presence of a plasma characterized by the electron plasma frequency. In our work, instead of considering the plasma, we consider a simple transparent refractive medium...
The SNO+ detector is a multipurpose neutrino detector based at SNOLAB in the Creighton mine in Ontario, Canada. Due to the 6010m.w.e overburden at SNOLAB, SNO+ experiences an average of 3 high energy cosmogenic muons per hour passing through the 6m radius Acrylic Vessel. These muons can create spallation neutrons and long lived unstable isotopes that can present a background to the...
Any experiment aiming to measure coherent elastic neutrino-nucleus scattering (CEvNS) via nuclear recoils in cryogenic bolometers relies crucially on a precise detector calibration at sub-keV energies.
CRAB proposes a new calibration technique relying on the capture of thermal neutrons inside the target crystal. The subsequent emission of $\gamma$-rays of O(10 MeV) induces nuclear recoils at...
DANSS is a detector of reactor antineutrinos based on solid state scintillator
placed on a movable platform below the core of 3.1 GW industrial reactor of Kalininskaya NPP. DANSS detects up to 5000 neutrino events per day with the only 2% background. DANSS is collecting data for 6 years with more than 6 million inverse beta-decay events already collected. The primary goal of the experiment...
The Daya Bay Reactor Neutrino Experiment was designed with the primary goal of precisely measuring the neutrino mixing parameter, $\theta_{13}$. Eight identically-designed gadolinium-doped liquid scintillator detectors installed in three underground experimental halls measure the reactor antineutrinos from six nuclear reactors with different distances. Until its shutdown at the end of 2020,...
We present a generic structure (the layer structure) for decoherence effects in neutrino oscillations by combining the concept of the open quantum system and quantum field theory, which include and parameterize decoherence effects from quantum mechanical and classical uncertainties. With the help of the layer structure, we classify the former as state decoherence (SD) and the latter phase...
The Pacific Ocean Neutrino Experiment (P-ONE) is an initiative to develop a new neutrino telescope to be deployed in the Northern Pacific Ocean, off the shore of British Columbia. This neutrino telescope will allow us to search for astrophysical neutrino sources and gain significant insights into the physics of the cosmos. A pathfinder mission was deployed in 2018 to study the optical...
The MicroBooNE detector, located in the Booster Neutrino Beamline (BNB) at Fermilab, has been operating since 2015. MicroBooNE's Liquid Argon Time Projection Chamber is accompanied by a Photon Detection System (consisting of 32 PMTs) used to measure the argon scintillation light and determine the timing of the neutrino interactions. This work demonstrates the analysis techniques developed to...
ZICOS is a future experiment for 0$\nu \beta \beta$ of $^{96}$Zr nuclei. In order to achieve sensitivity over $10^{27}$ years, ZICOS will use tons of $^{96}$Zr, and need to remove $^{208}$Tl backgrounds as observed by KamLAND-Zen one order of magnitude. For this purpose, we have developed new technique to distinguish the signal and background using topology of Cherenkov light. We have measured...
Abstract
Nowadays the standard way to describe neutrino oscillations is the quantum-mechanical approach in terms of plane waves, because the current description of the phenomenon within quantum field theory with the help of localized wave packets is very bulky [1]. However, there was an earlier attempt to describe neutrino oscillations within the standard Feynman diagram technique [2]. We...
The detector of Jiangmen Underground Neutrino Observatory (JUNO) is the largest underground liquid scintillator detector in the world, and it is expected to start data-taking in 2023. The JUNO detector mainly consists of a 20 kton liquid scintillator and a large number of photomultiplier tubes. It will work as a multi-purpose detector, aiming to determine the neutrino mass ordering as its...
In this work we study the potential of the future experiments INO, JUNO and T2HK to determine the neutrino mass ordering. When these three experiments are combined, one can achieve mass ordering sensitivity at a significant confidence level irrespective of the energy resolution of JUNO or the value of $\delta_{\rm CP}$. The main synergy between the reactor experiment and the...
A joint oscillation analysis of atmospheric neutrinos at Super-Kamiokande (SK) and accelerator neutrinos at Tokai-to-Kamioka (T2K) is in preparation. Apart from the increase in statistics and the lifting of degeneracies providing improved constraints on oscillation parameters, the systematics in T2K and SK’s analyses share many common features and have been carefully studied for the joint...
The KATRIN experiment aims at the direct measurement of the electron neutrino mass with $\,0.2\,$eV/c² sensitivity. The high luminosity windowless gaseous molecular tritium source together with the magnetic adiabatic collimation of the electrostatic (MAC-E) filter technique allows for precision endpoint spectroscopy of the tritium beta decay. The analyses of the first and second tritium...
The Hyper-Kamiokande experiment (HK) is a complex of an intense neutrino beam facility, J-PARC, and a large water Cherenkov detector, HK. It covers wide physics goals, for instance, precise measurements of neutrino oscillation, proton-decay search, and supernovae neutrino detection. The neutrino detector HK will be equipped with 20,000 PMT of 50 cm diameter, whose timing resolution is 1 ns and...
We show that the crucial measurement of the CP violation phase ($\delta_{\mathrm{CP}}$), planned to be performed at the DUNE experiment, can be spoiled if we assume the decoherence phenomena in nature, with sizeable effects. Considering this framework, we find that the $\sin^2{\theta_{13}}$ and $\delta_{\mathrm{CP}}$ can be distorted from the current best-fit values. The discrepancies for...
Lorentz violation (LV) and non-standard interactions (NSI) are two of the most popular scenarios beyond the Standard Model (BSM) of particle physics. Both of these BSM physics can affect neutrino oscillation significantly. However, their effects can mimic each other, and it would be difficult to distinguish between them at a long-baseline experiment. Here, we show how the atmospheric...
Exposing kt-scale water-based liquid scintillator (WbLS) optical detectors to GeV-level neutrino beams provides a unique opportunity to make both a world-leading long-baseline high-energy neutrino oscillation measurement and numerous unprecedented low-energy physics measurements. For long-baseline neutrino oscillation measurements, WbLS detectors such as Theia, have comparable performance to...
The standard three-neutrino oscillation framework seems to be rather established; however, the percentage level of the precision on the mixing parameters still leaves room for effects not described by the standard physics. Future long baseline (LBL) accelerator experiments will play an important role in the search for new physics effects in neutrino oscillations. Indeed, such experiments will...
The unified approach of Feldman and Cousins allows for estimating confidence intervals for datasets with small statistics that commonly arise in high energy physics. It has gained widespread use, for instance, in measurements of neutrino oscillation parameters in long-baseline experiments. However, the approach is computationally intensive as it is typically done in a grid-based fashion over...
Coherent elastic neutrino-nucleus scattering (CEνNS) is a new tool for examining the Standard Model and searching neutrino electromagnetic properties, which can be a manifestation of new physics [1]. We study the electromagnetic contribution to elastic neutrino-nucleon and neutrino-nucleus scattering processes. Following our approach developed for the case of elastic neutrino-electron [2] and...
The NUCLEUS experiment aims for the first fully coherent detection of coherent elastic neutrino-nucleus scattering (CE$\nu$NS) at a new experimental site between the two 4 GWth reactor cores of the Chooz power plant. The signature of a CE$\nu$NS event will be a nuclear recoil at the 20 eV-scale inside a CaWO4 target crystal. At this energy scale, a reliable simulation of...
The Project 8 experiment is a next generation neutrino mass experiment that aims to measure the absolute neutrino mass with a sensitivity of 40 meV by measuring the electron energy spectrum close to the tritium beta endpoint. To overcome statistical and systematic limitations of current direct neutrino mass experiments, Project 8 uses the new detection method of cyclotron radiation emission...
The nuclear matrix element of neutrinoless double-β decay is an essential input for determining the neutrino effective mass, if the half-life of this decay is measured. Reliable calculation of this nuclear matrix element has been a long-standing problem because of the diversity of the predicted values of the nuclear matrix element, which depends on the calculation method. In this study, we...
Primordial black holes (PBHs) with initial mass ~10^15 g are currently breathing their last breaths due to Hawking radiation. As transient burst events, their deaths are expected to produce copious amounts of neutrinos, both directly and indirectly from the decay of other emitted particle species. If such a PBH burst occurs in the local neighborhood, they can produce a detectable signal in our...
We present a phenomenological study of MicroBooNE’s ability to investigate $e^+e^-$ final states produced in dark photon mediated neutrino-upscattering—a beyond-Standard Model process proposed as a solution to the MiniBooNE anomaly. Utilising the similarities shared between the observable signatures of neutrino-induced $e^+e^-$ and single photons originating in the radiative decays of the...
We explore the neutrino signals from proton decays catalyzed by GUT monopoles in the Sun. Three typical proton decay modes, $p \rightarrow e^+ \pi$, $p \rightarrow \mu^+ K^0$ and $p \rightarrow \bar{\nu}_e \pi^+$, have been analyzed for the Super-Kamiokande experiment. The monopole-induced neutrinos arise from interactions and subsequent decays of the proton decay products. To obtain the...
The seesaw models can naturally explain the neutrino masses and the matter-antimatter asymmetry of our universe. The seesaw scale is usually very high and one can integrate out the heavy degrees of freedom to obtain the seesaw effective field theory (SEFT). We establish the connection between the full seesaw model and the low-energy SEFT from a complete new point of view: the invariant theory....
The discovery of the phenomena of neutrino oscillations suggests that neutrinos have non-zero masses, providing solid experimental evidence for physics beyond SM (BSM). To explain the non-zero masses of neutrinos, SM needs an extension. We use the Standard Model Extension (SME) framework to analyze Lorentz Invariance Violation (LIV), wherein the LIV effects are treated as a perturbative effect...
The time profile of neutrino emissions from core-collapse supernovae contains unique information about the dynamics of the collapsing stars and the behavior of particles in dense en- vironments. The observation of neutrinos from the SN1987A supernova, in the Large Magellanic Cloud, marked the beginning of neutrino astronomy. To date, no other supernova neutrino obser- vation has been made. It...
PROSPECT-I, the first phase of the Precision Reactor Oscillation and SPECTrum Experiment, demonstrated the observation of reactor antineutrinos in an aboveground detector with good energy resolution and well-controlled backgrounds at a baseline of $\sim$7m from the High Flux Isotope Reactor (HFIR) reactor at Oak Ridge National Laboratory. The PROSPECT collaboration is now preparing an upgraded...
The goal of the SoLid experiment is to conduct a search for active-to-sterile anti-neutrino oscillation at a very short distance (6.3-8.9 m) from the core of the SCK-CEN BR2 research reactor in Mol, Belgium, and provide a unique and complementary test of the so-called Reactor Antineutrino Anomaly. A secondary objective of the experiment is to measure the pure U-235 antineutrino spectrum with a...
This poster shows the use of Zonal Harmonic Field Expansion for fast electric and magnetic field simulations with the superposition principle, and for near-realtime adiabatic electron tracking. Various measurements in the KATRIN experiment require special main spectrometer coil current and electrode potential configurations, most prominently the recent Shifted Analyzing Plane background...
The IceCube Neutrino Observatory, a gigaton ice Cherenkov detector located at the South Pole, detects a high rate of atmospheric neutrinos. The DeepCore array extends IceCube’s detection of atmospheric neutrinos down to GeV-scales, which is the range necessary to measure neutrino oscillations. With the high statistics atmospheric neutrino sample, the reconstruction of GeV-scale IceCube...
SNO+ is a phased experiment to ultimately search for neutrinoless double beta decay in a Tellurium-loaded liquid scintillator detector. From 2017 to 2019, SNO+ operated as a pure water Cherenkov detector with a very low energy threshold. The 2.2 MeV gammas, characteristic of neutron captures, were detected with an efficiency around 50%, allowing the identification of inverse beta decays...
The CONUS experiment aims at detecting coherent elastic neutrino nucleus scattering (CE$\nu$NS) at the commercial nuclear power plant in Brokdorf, Germany. A high antineutrino flux is guaranteed at a distance of 17.1m to the reactor core with a maximum thermal power of 3.9GW$_{th}$. The recoils induced by the neutrinos are detected with four low energy threshold point-contact high-purity...
The KM3NeT neutrino telescope is currently being deployed in the Mediterranean Sea. While the two sites, ORCA designed to study sub-TeV neutrinos and ARCA optimized for the TeV-PeV range, are not yet completed, the current effective area allows us to carry out the first searches for astrophysical neutrinos. In this contribution, we present the results of the search for MeV-TeV neutrinos from...
Seesaw mechanism is a popular approach to give a viable explanation to the source of non-zero neutrino mass and to the cause of matter dominance of the Universe - two of the most important open problems that could not be answered by the Standard Model (SM) of Particle Physics. A minimal extension of the SM is studied, incorporating type-I+II seesaw mechanism with only one right-handed neutrino...
Arrays with tens to hundreds of Metallic Magnetic Calorimeters (MMCs), each implanted with $^{163}$Ho, were selected for the ECHo experiment, because of the excellent energy resolution of up to 2-3 eV, a fast response time below 1 µs, and a near-linear detector response that allows for a reliable energy calibration. Based on the performance achieved with the detectors developed for the first...
In the ECHo experiment, the effective electron neutrino mass can be determined by the analysis of the endpoint region of the calorimetrically acquired $^{163}$Ho electron capture spectrum. The spectrum was acquired using arrays of tens of low temperature metallic magnetic calorimeters enclosing the source. The fraction of $^{163}$Ho events which are in the region of interest can be as small as...
Last year the Tibet ASgamma experiment reported the observation of a diffuse gamma-ray emission from the Galactic plane with energy up to the PeV. This finding seems to be confirmed by LHAASO preliminary results. Both measurements provide the first evidence of a diffuse gamma-ray emission throughout the Galaxy up to such high energies.
These results have relevant implications for neutrino...
The recent detection of the coherent elastic neutrino-nucleus scattering (CE$\nu$NS) opens the possibility to use neutrinos to explore physics beyond standard model with small size detectors. However, the CE$\nu$NS process generates signals at the few keV level, requiring of very sensitive detecting technologies for its detection. The European Spallation Source (ESS) has been identified as an...
Recent follow-up campaign of IceCube neutrino alerts carried out by the Zwicky Transient Facility (ZTF) Collaboration has led to a transient association of a muon-track candidate (IC200530A) with the optical transient AT2019fdr. The transient has been classified as a Tidal Disruption Event by ZTF. Nevertheless, considering the photometric and spectroscopic properties of the event, a...
Neutrino emission from supernovae has played a transformative role in the development of neutrino physics and our understanding of how the stars collapse. Growing evidence has established the presence of dense circumstellar material for core-collapse supernova, and the interaction of accelerated cosmic rays in the supernova ejecta and the circumstellar material will produce high-energy...
Sterile neutrinos with keV-scale masses are popular candidates for warm dark matter. In the most straightforward case they are produced via oscillations with active neutrinos. We introduce effective self-interactions of active neutrinos and investigate the effect on the parameter space of sterile neutrino mass and mixing. Our focus is on mixing with electron neutrinos, which is subject to...
Effects of neutrino charge radius and magnetic moment constraints obtained from the astrophysical observations and reactor experiments as well as in-medium modifications of the constituents matter of neutron star (NS) on the electroweak interaction with matter in NS is investigated. Our interesting result on the neutrino mean free path and differential cross section with the neutrino form...
In the last decade, the IceCube Collaboration reported the existence of an astrophysical neutrino flux of ultra-high energy. In this extreme energy limit, the neutrino-nucleon interaction does occur in a kinematic domain inaccessible to the present terrestrial colliders. This situation is especially relevant when we consider the squared of the transferred momentum, Q², which can assume values...
We assess how the production of heavy neutral leptons (HNL) at the DUNE flux can affect the number of neutrino charged current (CC) events at the DUNE ND LArTPC. A deficit in the number of CC events at the LArTPC should be observed for HNLs with masses below the kaon mass. We estimate upper limits on the mixing parameters from the aforementioned deficit. We find that these limits are stronger...
The discovery of the phenomena of neutrino oscillations was the first firm experimental evidence of physics beyond the Standard Model (SM). To explain the neutrino masses and mixing, it requires an extension of the SM, called as beyond SM (BSM). The models describing BSM physics often comes with some additional unknown couplings of neutrinos termed as Non Standard Interactions (NSIs) [1]. The...
Neutrino oscillation experiments measure oscillation probabilities as functions of neutrino energy. The success of these experiments therefore largely depends upon their neutrino energy reconstruction accuracies. Nuclear effects and detector effects, however, can significantly affect neutrino event topologies seen by experiments in few-GeV energy region, and lead to large systematic...
In electron capture processes, an electron of the parent atom is captured by the nucleus and an electron neutrino is emitted, leaving the daughter atom in an excited state. Precise calculations of the atomic de-excitation processes can be performed for isolated atoms. In practice, radioactive decay occurs with the atom in a medium. We present the possibility to study effects the environment...
The use of spacings between ordered real-valued numbers is very useful in many areas of science. In particular, either unnaturally small or large spacings can be a signal of an interesting effect.
We introduce new statistical tests based on the observed spacings of ordered data. These statistics are sensitive to detect non-uniformity in random samples, or short-lived features in event time...
The IsoDAR neutrino source comprises a novel compact cyclotron capable of delivering 10 mA of 60 MeV protons in cw mode and a high-power neutrino production target. It has obtained preliminary approval to run at the new underground facility Yemilab in South Korea. IsoDAR will produce a very pure, isotropic $\bar{\nu}_e$ source, with peak neutrino energy around 6 MeV and endpoint around 15 MeV....
This poster presents a joint determination of the spectra of the reactor antineutrinos resulting from fissions of $^{235}U$ and $^{239}Pu$ by the Daya Bay and PROSPECT experiments. In the Daya Bay experiment, the antineutrinos were generated by six low-enriched uranium (LEU) commercial reactors with 2.9 GW thermal power each and detected by eight antineutrino detectors deployed in...
Rare event searches allow us to search for new physics at energy scales inaccessible with other means by leveraging specialized large-mass detectors. Machine learning provides a new tool to maximize the information provided by these detectors. The information is sparse, which forces these algorithms to start from the lowest level data and exploit all symmetries in the detector to produce...
The Weakly Interacting Massive Particles (WIMPs) so far remain one of the most popular candidates for dark matter. If captured gravitationally inside the core of the Sun, these WIMPs may produce high energy neutrinos as the end product in case they undergo self annihilations at the solar core. In this work, we address the detectability of such neutrinos at the proposed KM3NeT detector. Upper...
The KM3NeT/ARCA neutrino telescope will be fundamental to unveil the high-energy cosmic neutrino sources. In this contribution, we present the expectations of this detector for starburst galaxies observation, both as a diffuse signal and as point-like excess. To describe the diffuse flux, we make use of a recent theoretical model which implemented a “blending” of spectral indexes for...
Large liquid scintillator detectors, such as JUNO, present a new opportunity to study neutral current events from the low-energy end of the atmospheric neutrinos, and possible new physics signals due to light dark matter. We carefully study the possibility of detecting Large Energy Singles (LES), i.e., events with visible scintillation energy $>15$ MeV, but no other associated tags. For an...
The IceCube Neutrino Observatory is a gigaton-scale Cherenkov detector located within the South Pole glacial ice. The detector's sensitivity to neutrino signals from GeV to PeV energies allows for probes into hypothetical energy-sensitive nonstandard interactions (NSI). Using the range of matter baselines provided by Earth, IceCube has been able to constrain neutral-current NSI by searching...
In this work, we have modified a scenario, originally proposed by Grimus and Lavoura, in order to obtain maximal values for atmospheric mixing angle and $CP$ violating Dirac phase of the lepton sector. To achieve this, we have employed $CP$ and some discrete symmetries in a type II seesaw model. In order to make predictions about neutrino mass ordering and the smallness of the reactor angle,...
The extension of the standard model with new high-scale weakly coupled physics involving right-handed neutrinos in an effective field theory framework (SMNEFT) allows for a systematic study of heavy neutrinos phenomenology in current and future experiments. We exploit the outstanding angular resolution in future lepton colliders to study the sensitivity of forward-backward asymmetries to...
In a model with additional U(1) symmetry, anomaly free, the mass of the active neutrinos is generated by the inverse see saw mechanism. The muon and tau get masses at the tree level and the mass of the electron is generated by effective operators of dimension 7 by introducing a Lambda scale. Using a Monte Carlo simulation, the model parameters are adjusted according to the mass of the charged...
The IceCube low energy extension DeepCore observes GeV-scale atmospheric neutrino events that only illuminate a small fraction of its photosensors. This makes event reconstruction challenging, and this challenge is magnified by the complex neutrino event topologies and the difficulty in modeling Cherenkov photon propagation in an inhomogeneous medium. These effects inhibit the use of analytic...
One of the most popular candidate of Dark Matter (DM) particle are the Weakly Interacting Massive Particles(WIMPs). These, once gravitationally captured in massive celestial objects and annihilating between them into Standard Model particles, can be indirectly detected. The centre of those massive objects is, therefore, a place where to look for a possible neutrino excess from DM annihilations...
It is possible to increase sensitivity to low energy physics in a third or fourth DUNE-like module with careful controls over radiopurity and some modifications to a detector similar to the DUNE Far Detector design. In particular, sensitivity to supernova and solar neutrinos can be enhanced with improved MeV-scale reach. A neutrinoless double beta decay search with 136Xe loading appears...
Super-Kamiokande has observed boron-8 solar neutrino recoil electrons at kinetic energies as low as 3.49 MeV to study neutrino flavor conversion within the sun. At SK-observable energies, these conversions are dominated by the Mikheyev–Smirnov–Wolfenstein effect. An upturn in the electron survival probability in which vacuum neutrino oscillations become dominant is predicted to occur at lower...
The Jiangmen Underground Neutrino Observatory (JUNO) is a neutrino medium baseline experiment under construction in southern China, expecting to begin data taking in 2023.
The experiment has been proposed with the main goals of determining the neutrino mass ordering and measuring three oscillation parameters with sub-percent precision.
To reach these goals, JUNO is located about 53$\,$km...
We consider relatively heavy neutrinos νH, mostly contributing to a sterile state νs, with mass in the range 10 MeV ≲ms≲mπ∼135 MeV, which are thermally produced in the early universe in collisional processes involving active neutrinos, and freezing out after the QCD phase transition. If these neutrinos decay after the active neutrino decoupling, they generate extra neutrino radiation, but also...
Astrophysical neutrinos are mysterious particles of ultra-high energies with no known progenitor. Since 2011, the IceCube neutrino observatory has been detecting numerous neutrino events with energies of hundreds of TeV. However, it hasn’t been able to pinpoint source for the majority of events. The only exception is IceCube-170922A whose source is believed to be a blazar TXS 0506+056 that was...
Results of experiments like LSND and MiniBOONE suggest the presence of an eV scale sterile neutrino. We investigate the resonance matter effect in presence of sterile neutrino and present the analytical expressions of the neutrino oscillation/survival probabilities using Δ21=0 approximation. These analytical expressions help us to understand better the existing degeneracies, e.g.,...
KM3NeT/ORCA is a neutrino telescope currently under construction in
the Mediterranean Sea near Toulon, France. Its ultimate goal is the
determination of the neutrino mass ordering based on several years of
data taking with an instrumented seawater mass of about 7 Mton. From
January 2020 until November 2020 KM3NeT/ORCA accumulated data
with six detection units, which corresponds to about...
The DeepCore detector is a densely instrumented sub-array of the IceCube Neutrino Observatory designed to observe atmospheric neutrino interactions above 5 GeV via Cherenkov radiation in the Antarctic ice. At these energies, Earth-crossing muon neutrinos have a high chance of oscillating into tau neutrinos. While DeepCore is able to measure the atmospheric oscillation parameters with a...
The IceCube Neutrino Observatory detects neutrinos at energies orders of magnitude higher than those accessible to current accelerator neutrinos and probes fundamental neutrino properties at energies otherwise not accessible. Above 40 TeV, neutrinos of astrophysical and atmospheric origin traveling through the Earth will be absorbed as they interact with nuclei, changing the zenith angle...
The Spallation Neutron Source (SNS), used by the COHERENT experiment as a source of neutrinos to measure CE$\nu$NS cross section, produces $\nu_e$, $\nu_{\mu}$, and $\bar{\nu}_{\mu}$ in energy ranges of a few tens of MeV. A heavy water Cherenkov detector is under construction to measure this neutrino flux in support of CE$\nu$NS measurement. The heavy water detector can also be used to measure...
When a burst of neutrinos from a core-collapse supernova (CCSN) passes by the Earth, it causes a permanent change in the local space-time metric, called the gravitational wave (GW) memory. Long considered unobservable, this effect will be detectable in the near future, at deci-Hertz GW interferometers. I will present a novel idea, where observations of the neutrino GW memory from CCSNe will...
Many astrophysical sources can emit neutrinos in the energy below a few to several MeVs. Detecting such neutrinos will provide us with valuable information on the physical processes that govern their evolution and structure. So far, neutrinos only from the Sun and a single event of supernova (SN 1987A) have been observed. However, as the size of neutrino observatories keep increasing and the...
The observation of the neutrino burst coming from the next Galactic Core-Collapse SuperNova (CCSN) and its gravitational wave and electromagnetic counterparts will provide us invaluable information on this extreme phenomenon. KM3NeT is a neutrino telescope consisting of two detectors, ORCA and ARCA, currently under deployment in the Mediterranean Sea. By searching for an excess of coincidences...
Upcoming neutrino telescopes may soon be able to discover ultra-high-energy (UHE) cosmic
neutrinos, with energies beyond 100 PeV. Finding their sources would provide robust candidates
for the long-sought sources of ultra-high-energy cosmic-rays. We propose to do so by looking for
multiplets of UHE neutrinos in the sky. Focusing on neutrino radio-detection in IceCube-Gen2 as
a benchmark, we...
For decades, secondary scintillation in noble gases was assumed to be solely due to VUV emission from excimers, created in a three-body collision of two neutral atoms and one excited atom produced by electron impact - the so-called electroluminescence (EL) process.
Neutral Bremsstrahlung (NBrS) is non-excimer-based secondary scintillation, emitted when drifting electrons scatter on neutral...
We present how small Dirac neutrino masses can be produced by introducing many light mixing partners for the neutrino within the framework of TeV scale Quantum Gravity Theories. We give a general formula how to calculate the resulting SM flavor eigenstates in this context. This infrared way of generating neutrino masses leads to deviations in the oscillation behaviour of SM neutrinos.Then we...
Axions and axion-like particles (ALPs) are some of the most popular candidates for dark matter [1]. Axions are also considered [2] as new physics contributions to the muon g – 2 . Following the existed interest to ALPs we consider interaction between neutrinos and hypothetical axion-like particles and derive for the first time the probability of neutrino oscillations accounting for their...
We study the capability of INO-ICAL to determine the atmospheric neutrino oscillation parameters. We do not use any generator level information but instead use only the output of GEANT4 simulation of the atmospheric neutrino events in the detector. In a similar previous study, by other authors, only the momentum and direction of the longest track were used. In this study, we consider a third...
The information about the Earth's interior structure comes from seismic studies and gravitational measurements. The Preliminary Reference Earth Model (PREM) of the density of the Earth is obtained by measuring the travel time of seismic waves. Here, the density distribution inside the Earth is estimated from the model-dependent empirical relations having assumptions based on temperature,...
Astrophysical objects capable of hadronic acceleration to relativistic energies have long been believed to be sources of astrophysical neutrinos. Nevertheless, the long exposure neutrino sky map shows no significant indication of point-like sources so far. This may point to flaring objects or a large population of faint, steady sources as origins of this flux. The spatially and temporally 3σ...
The aim of this presentation is to introduce a dark extension of the SM that communicates to it through three portals: neutrino, vector and scalar mixing, by which it could be possible to explain the LEE at MiniBooNE. The model regards particularly the upscattering of HNLs (1 to N heavier Dirac or Majorana neutrinos) by the mediation of a dark photon, Z’, with masses around 10 MeV – 2 GeV,...
We discuss the contribution of right-handed neutrinos (RHNs) to the neutrinoless double beta decay within the minimal type-I seesaw model by virtue of the intrinsic seesaw relation of neutrino mass and mixing parameters, and the mass dependence of the nuclear matrix elements from different nuclear models. In the viable parameter space, we find the possibilities of both the enhancement and...
In ref.[1], we have reported the quantification of bipartite and tripartite entanglement measures in two and three neutrino systems, respectively. In the tripartite system, the correlations exhibited by neutrino oscillations are like the W-states which are legitimate physical resources for quantum information tasks. Moreover, quantum studies of neutrinos has been done on IBMQ processors in...
Reactor anti-neutrinos after being discovered for the first time by Reines and Cowan, have been observed and studied by various neutrino physics experiments for different purposes. Electron anti-neutrinos are elementary particles that are inextricably associated with nuclear fission and are produced in a nuclear reactor as a result of beta decay of fissioning isotopes. Since the amount of...
Non-local correlations are usually quantified in terms of Bell's inequality parameter [1]. Recently it was shown that a non-local advantage of quantum coherence (NAQC) is a stronger measure of non-locality as compared to Bell's inequality parameter in the neutrino systems [2]. We analyse the effects of non-standard interaction (NSI) on these measures in the context of several accelerator and...
The Nu Tools study was developed to explore the potential roles for neutrino within nuclear energy and nuclear security. This effort differs from previous neutrino detector studies as it is focused on the potential utilities and determining if there is a possible use case for neutrino detectors as a monitoring technology. Due to the importance of understanding potential use cases, this effort...
All the neutrino/antineutrino experiments being performed in the few GeV energy region are using moderate to heavy nuclear targets where the contribution to the cross section comes from the quasielastic, inelastic and deep inelastic scattering processes. A better understanding of hadron dynamics in the nuclear medium is required to reduce the systematics considerably in the analyses of...
The KArlsruhe TRItium Neutrino experiment currently provides the best neutrino mass upper limit of 0.8 eV/c2 (90% C. L.) in the field of direct neutrino-mass measurements [1]. This result has been obtained with only 5% of the anticipated total measurement time. However, reaching the target sensitivity of 0.2 eV/c2 at 90% C. L. not only requires the full measurement time, but also the detailed...
KM3NeT is a multi-purpose cubic-kilometer neutrino observatory under construction in two different sites of the Mediterranean Sea. It consists of ORCA and ARCA (for Oscillation and Astroparticle Research with Cosmics in the Abyss, respectively) telescopes, currently taking data with the first set of detection lines in operation. Although having different primary goals, both detectors can be...
When a neutrino propagates through a medium, the oscillations are modified by forwarding scattering with particles of the medium, which generates a potential in the Hamiltonian. The most famous one is the Wolfenstein potential due to forward scattering with electrons, which leads to the MSW effect. In environments with a high density of neutrinos, such as in supernovae and the early universe,...
In this paper, we study the hierarchy sensitivity of Protvino to ORCA (P2O) experiment in three flavor scenario as well as its sensitivity to non-standard interactions (NSI) in neutrino propagation. Because of the largest possible baseline length of 2595 km, P2O is expected to have strong sensitivity towards neutrino mass hierarchy and NSI parameters. In our study, we show that even though the...
Particle-identification (PID) is a crucial part for all analyses performed with the KM3NeT neutrino telescopes. It is used to separate atmospheric neutrino from background events (atmospheric muons, $ ^{40}\mathrm{K}$ decay) and further, to distinguish track- and shower-like events, allowing the identification of the neutrino flavour.
One of the main algorithms used for event classification...
The PALEOCCENE concept offers the potential for room-temperature, passive, crystal-based detectors for the detection of low-energy nuclear recoil events. Nuclear recoil events can be caused by coherent elastic neutrino nucleus scattering (CEvNS), neutron scattering, or dark matter scattering and therefore, PALEOCCENE could find applications in all three areas. Nuclear recoils result in damage...
In recent years, silicon photomultiplier (SiPM) has been widely used to replace photomultiplier tube (PMT) for scintillator readout, especially in high performance neutrino experiments. SiPM offers gain similar to those of PMT, but with merits such as higher quantum efficiency, low bias voltage, compact volume, high ruggedness, and magnetic field compatibility. However, SiPM is indeed inferior...
The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kt liquid scintillator detector with the main goal to determine the neutrino mass ordering. To reach this goal, JUNO is designed to have an energy resolution of 3%/$\sqrt{𝐸(\text{MeV})}$ and it will measure the reactor neutrino spectrum from two nuclear power plants located in a distance of around 53 km from the detector. One crucial...
KM3NeT is a research infrastructure that will house a network of next-generation neutrino detectors located in the seabed of the Mediterranean Sea. The infrastructure is currently under construction and consists in two configurations: atmospheric neutrino oscillation research at GeV energies (ORCA) and detecting high-energy cosmic neutrinos from Galactic and extra-Galactic sources (ARCA). The...
Reactor experiments provide an excellent platform to investigate the atomic ionization effects induced by the unexplored neutrino interaction channels. Including the atomic effects in our calculations, we study the neutrino-electron scattering by reactor anti-neutrinos in low-energy electron recoil detectors such as Si/Ge in light of neutrino non-standard interactions with leptons. We find...
We update and expand on past efforts to predict the leptonic Dirac CP-violating phase with models of perturbatively modified tribimaximal mixing. Simple perturbations are applied to the tribimaximal mixing pattern in the form of rotations between two sectors. By translating these perturbed mixing matrices to the standard parameterization for the neutrino mixing matrix we derive relations...
The NEXT collaboration is pursuing a phased program to search for neutrinoless double beta decay(0nubb) using high pressure xenon gas time projection chambers. Xenon gas detectors offer a key opportunity: the plausible implementation of single barium daughter ion tagging, an approach that may reduce radiogenic and cosmogenic backgrounds by orders of magnitude and unlock sensitivities that...
Since the weak sector is one of the only places explored by the Standard Model (SM), there is hope that studying neutrinos may provide insight into physics beyond the Standard Model (BSM). For this purpose, neutrino telescopes have broad programs searching for the effects of BSM physics; however, the phenomenological community, which predicts the observational effects of BSM models, does not...
We discuss the potential sensitivities of next-gen neutrino telescopes in the northern hemisphere, such as KM3NeT ORCA and ARCA on dark matter annihilation in the Galactic halo.
With its energy and angular resolutions, as well as advantages sky coverage taken into account, we show that KM3Net is expected to yield very competitive limits for dark matter annihilations. We also discuss the...
As an underground multi-purpose neutrino experiment with a detector of 20 kton liquid scintillator, Jiangmen Underground Neutrino Observatory (JUNO) is competitive with and complementary to the water-Cherenkov detectors on the search for the diffuse supernova neutrino background (DSNB). We employ the latest information on the DSNB flux predictions and investigate in detail the background and...
In this poster I would like to discuss our recent results on the pseudoscalar sterile neutrino self-interactions model.
In particular, we reassess the viability of a cosmological model including a fourth additional sterile neutrino species that self-interacts through a new pseudoscalar degree of freedom.
To that end, we perform a series of extensive analyses fitting various combinations of...
As an underground multi-purpose neutrino observatory with 20 kton liquid scintillator (LS), JUNO has excellent potential to first detect Diffuse Supernova Neutrino Background (DSNB). The dominant background for the DSNB is the Neutral-Current (NC) interaction of atmospheric neutrinos with C-12 nulei in LS. The final state particles of NC interactions usually contain α,p,n, in contrast to...
Charged-current quasielastic scattering is the signal process in modern neutrino oscillation experiments and one of the tools for the reconstruction of the incoming neutrino energy. Exploiting effective field theory, we factorize neutrino-nucleon quasielastic cross sections into soft, collinear, and hard contributions. We evaluate soft and collinear functions from QED and provide a model for...
Readout of low-intensity microwave signals over a wide bandwidth has become increasingly important for fundamental science. The high frequency allows high information transfer, ideal for multiplexing detectors and reducing low-frequency noise.
This work presents the design and calibration of frequency-multiplexed readout for Ricochet, a segmented coherent neutrino scattering detector. The...
The construction of the next-generation far detector Hyper-Kamiokande (HK) has started. It will have ten times larger fiducial volume and increased detection performances. The data taking is planned for 2027. Time stability is crucial, as detecting physics events relies on reconstructing Cherenkov rings based on the coincidence between the photomultipliers. The above requires a timebase jitter...
The experimental observations from the colliders established the standard model (SM), the most
successful phenomenological framework to explain the non-gravitational interactions of fundamental
particles at high energy. Non-zero neutrino mass and dark matter cast a shadow over its success.
This necessitates the extension of the SM. The most straightforward and elegant extension of the...
In 2020, we demonstrated significant evidence for bright radio blazars being a dominant source of high-energy astrophysical neutrinos seen by IceCube. Later years have brought more neutrino detections, which further increase the confidence of the neutrino-blazars association. A notable example is the recent IceCube alert on 2022-02-05 that came from the direction of the PKS 1741-03 blazar....
We study the status of the reactor antineutrino anomaly in light of recent reactor
flux models obtained with the conversion and summation methods. We present a
new improved calculation of the IBD yields of the standard Huber-Mueller (HM)
model and those of the new models. We show that the reactor rates and the fuel
evolution data are consistent with the predictions of the Kurchatov...
The antineutrino flux emitted from nuclear reactors is important for measuring neutrino
oscillations, probes of BSM physics with CEvNS and other interaction channels, and reactor
neutrino applications. Over the past decade, significant discrepancies have been uncovered
between the predicted and measured reactor antineutrino fluxes and energy spectra, motivating
the need for new...
The Jiangmen Underground Neutrino Observatory (JUNO), is under construction at Jiangmen, Guangdong, China. This experiment aims to study neutrino mass ordering with 3% energy resolution at 1MeV, a precise determination of neutrino oscillation parameters, and other neutrino physics with 20-kiloton liquid scintillator (LS) viewed by up to 20,000 high quantum efficiency (QE) 20-inch PMTs. The...
Reactor antineutrino detection technologies have advanced significantly in recent years, stemming from scientific investigations into the nature of the neutrino, which have necessitated technology innovations in new scintillators and detection methods. Since reactors are an enormous source of antineutrinos, the potential for antineutrino detectors being used in the reactor safeguards context...
EXO-200 is a single phase time projection chamber filled with liquid xenon enriched in $^{136}$Xe to 80.6$\%$ to search for its neutrinoless double beta decay ($0\nu\beta\beta$). EXO-200 stopped operation in Dec 2018 after two multi-year phases of successful operation. The complete dataset offers valuable opportunities for many interesting physics searches in addition to $0\nu\beta\beta$. Here...
This poster reports the results from a search for neutrino-induced neutral current (NC) resonant ∆(1232) baryon production followed by ∆ radiative decay in MicroBooNE. Data corresponding to MicroBooNE’s first three years of operations (6.80×10^20 protons on target) was used to select single-photon events with one or zero protons and without charged leptons in the final state. The background...
The IceCube Neutrino Observatory has detected a diffuse flux of high-energy astrophysical neutrinos in the TeV-PeV range. These neutrinos likely originate from extragalactic sources given their apparent isotropic distribution. Active Galactic Nuclei (AGN) form a class of astronomical objects which are promising neutrino source candidates given their high electromagnetic luminosity and...
Longstanding anomalies observed in short-baseline neutrino oscillation experiments have motivated an eV-scale sterile neutrino. Because of matter effects within the Earth, the existence of this particle would cause a deficit in the atmospheric and astrophysical muon neutrino flux at TeV energies for neutrinos crossing the Earth. We present the results of a search for an unstable sterile...
Search for low-energy Borexino's signals from fast radio bursts.
A.V. Derbin for the Borexino collaboration
The search for neutrino events in correlation with 42 most intense fast radio bursts (FRBs) has been performed using the Borexino data. We have searched for signals with visible energies above 250 keV within a time window of ±1000 s corresponding to the detection time of a particular...
CUPID-0 is a pilot experiment in scintillating cryogenic calorimetry for the search of neutrino-less double beta decay. 26 ZnSe crystals coupled to bolometric light detectors were operated continuously for two years. From its successful experience comes a demonstration of full alpha to beta/gamma background separation, the most stringent limit on the 82Se neutrino-less double beta decay, as...
STEREO is a segmented, Gd-loaded liquid scintillator calorimeter that studied anti-neutrinos produced by the compact, highly $^{235}$U-enriched reactor core of the Institut Laue-Langevin in Grenoble (France). The experiment ran from 2016 to 2020 and was designed to test the light sterile neutrino explanation of the Reactor Antineutrino Anomaly (RAA) by comparing the neutrino energy spectra...
Sterile neutrinos could have any mass ranging from eV to the Plank scale. Out of this broad mass range, the keV-scale is one of the most interesting regions because it is a viable dark matter candidate and could provide a better explanation for low-structure astrophysical observations than other dark matter candidates. We are searching for a sterile neutrino in the 1 keV – 20 keV mass range...
The existence of dark matter (DM) has been well-established by repeated experiments probing various length scales. Even though DM is expected to make up 85% of the current matter content of the Universe, its nature remains unknown. One broad class of corpuscular DM motivated by Standard Model (SM) extensions is weakly interacting massive particles (WIMPs). WIMPs can generically have a non-zero...
Tokai to Kamioka (T2K) is an accelerator long baseline experiment that measures the neutrino oscillation parameters by observing $\nu_\mu$ ($\bar{\nu}_\mu$) disappearance and $\nu_e$ ($\bar{\nu}_e$) appearance from a nearly pure $\nu_\mu$($\bar{\nu}_\mu$) beam. The experiment has both near and far detectors situated at 280 m and 295 km respectively from the beam production target. The far...
We discuss the impact of the coupling of neutrinos with a new light neutral gauge boson, $Z^\prime$, with a mass of less than 500 MeV in meson decay and short-baseline neutrino experiments. Scenarios in which a light gauge boson is coupled to neutrinos are motivated within numerous contexts which are designed to explain various anomalies in particle physics and cosmology. This interaction...
Over the past decades, theories have predicted the existence of heavy compact objects containing an extremely dense form of exotic matter named Strange Quark Matter (SQM). This type of hypothetical matter is composed of nearly equal quantities of up, down and strange quarks and is supposed to be the ground state of Quantum Chromodynamics. Nuclearites are the massive component of SQM particles....
While optimized for detecting neutrinos in the multi-GeV and TeV region, IceCube is also capable of detecting the large flux of MeV neutrinos from Galactic Core Collapse Supernovae that stream through the detector. This is achieved by analyzing the collective enhancement of the PMT rate on top of a low dark rate in the cold and inert ice deep in the Antarctic Glacier. For sufficiently close...
Pacific Ocean Neutrino Experiment (P-ONE) is a proposed undersea neutrino detector with pathfinders already deployed, targeting a 70-string (1400 digital optical module) full deployment. By deploying in a deep-sea environment, scattering is reduced relative to in-ice experiments, allowing event resolutions at or below a tenth of a degree. Our current event simulation is based on methods...
During a massive star’s death, ~99% of its energy is released in the form of neutrinos. Neutrinos of all flavors escape the core well before any light can. If detected, they can provide crucial information on stellar core collapse and its mechanisms. The SuperNova Early Warning System 2.0 (SNEWS 2.0) is a network of neutrino detectors around the globe that aim at detecting these neutrinos....
The recent studies of Plavin et al. (ApJ 894 (2020) 101, ApJ 908 (2021) 157) have
shown interesting evidence for an association between high energy neutrinos detected
by IceCube and radio-selected blazars. The catalog used in these analyses is an all sky
flux-limited complete sample of 3411 blazars selected according to their compact radio
flux density at 8 GHz. A search for a spatial...
The KATRIN collaboration aims to determine the neutrino mass with a
sensitivity of 0.2 eV/c2 (90 % CL). This will be achieved by measuring the endpoint region of the tritium β-electron spectrum. Combined analysis of the first two KATRIN measurement campaigns yielded a neutrino mass limit of mν ≤ 0.75 eV (90 % CL).
Analyses of data from the first five measurements...
The Jiangmen Underground Neutrino Observatory (JUNO) is a next-generation neutrino experiment under construction in China. Using 20 kilotons of liquid scintillators, its primary goal is to detect neutrinos from nuclear power plants and determine the neutrino mass ordering. As an observatory that will operate for the next few decades, it will also study interesting phenomena involving GeV...
The Karlsruhe Tritium Neutrino (KATRIN) experiment probes the effective electron anti-neutrino mass by a precision measurement of the tritium beta-decay spectrum near the endpoint. A world-leading upper limit of 0.8 eV (90 % CL) has been set with the first two measurement campaigns. New operational conditions for an improved signal-to-background ratio, the reduction of systematic uncertainties...
Neutrino-electron elastic scattering is a purely leptonic process whose cross section can be precisely calculated in the standard model. A measurement of this process can provide an in-situ constraint to the absolute neutrino flux in an accelerator-based $\nu_\mu$ beam. NOvA is a long-baseline neutrino experiment optimized to observe the oscillation of muon neutrinos to electron neutrinos....
Precise understanding of neutrino-nucleus cross sections is necessary for neutrino oscillation experiments to make accurate measurements of neutrino oscillation parameters, such as the CP violation phase $\delta_{CP}$, the mixing angle $\theta_{23}$, and the neutrino mass hierarchy. The NOvA Near Detector provides an excellent environment to make measurements of neutrino cross sections due to...
The Deep Underground Neutrino Experiment (DUNE) is a leading experiment in neutrino physics which is presently under construction. DUNE aims to measure the yet unknown parameters in the three flavor oscillation scenario which includes discovery of leptonic CP violation, determination of the mass hierarchy and determination of the octant of $\theta_{23}$. Additionally, the ancillary goals
of...
In-situ production of long-lived isotopes by cosmic muon interactions may generate a non-negligible background for deep underground rare event searches. The underground production of $^{77(m)}$Ge through fast neutron capture on $^{76}$Ge has been identified as the main in-situ cosmogenic background [1] in the future ton-scale experiment LEGEND-1000 [2] searching for $0\nu\beta\beta$ of...
The NEOS searches for sterile neutrinos by detecting reactor antineutrinos at a very short baseline in Korea. The NEOS detectors (1-ton Gd-LS) were deployed at the tendon gallery of the Hanbit reactor unit 5 (2.8 GW thermal power), 24 m away from the reactor core. In NEOS-I, the prompt energy spectrum from inverse-beta-decay was measured using 180 live-days of reactor-on data, which clearly...
Neutrinos are generated via various physics processes in the Sun, such as nuclear fusion in the core, and solar flares due to the reconnection of magnetic field lines above sun spots. Those neutrinos provide information about neutrino properties, nuclear physics, and astrophysics. Super-Kamiokande (SK) is a multi-purpose water Cherenkov detector in Japan and studies neutrino interactions in...
Activated Carbon Fiber (ACF) is an adsorbent with a large specific surface area and a well-developed pore structure. ACF has micropores on its surface and thus has excellent adsorption speed. Because of its high adsorption speed, it is highly effective in adsorbing trace contaminants in a single pass.
Radon is one of the major common backgrounds in underground experiments, including solar...
The origin of the relatively high solar system abundances of certain proton-rich isotopes in the $90 < A < 100$ mass range has been an enduring mystery in nuclear astrophysics. An attractive proposal to solve this problem is called the $\nu p$-process. This process could operate in a hot bubble of a core-collapse supernova, which is formed by a neutrino-driven outflow from the surface of the...
In recent years the study of neutrino properties has raised a lot of interests in the Particle and Astroparticle physics communities. The discovery of coherent elastic neutrino nucleus scattering (CE$\nu$NS), as new highly sensitive detection channel has unleashed an impressive discovery potential.
Cryogenic detectors are now proposed for the detection of astrophysical neutrino sources via...
T-violation in neutrino oscillations in vacuum is a well known fact. Due to the CPT theorem this fact is strictly connected with the CP violating phase in the neutrino mixing matrix. Since neutrino interaction with matter or external electromagnetic field violates Lorentz invariance, the influence of external conditions can lead to T violation even in the model with real mixing matrix, e.g. in...
T2K (Tokai to Kamioka) is a long-baseline neutrino oscillation experiment
located in Japan. One of the most challenging tasks of T2K is to determine
whether CP is violated in the lepton sector. By utilizing the near detector (ND280) data, T2K can constrain neutrino interaction and flux uncertainties by fitting a parametrised model to data.
This allows for a significant reduction of the...
Based on our paper (arXiv:2201.06733) we discuss the prospects to take a picture of an extended neutrino source, i.e., resolving its angular luminosity distribution. This is challenging since neutrino directions cannot be directly measured but only estimated from the directions of charged particles they interact with in the detector material. This leads to an intrinsic blurring effect. We...
We present the results of the first simulation based analysis of tau neutrino events at the proposed magnetized Iron Calorimeter (ICAL) detector in the India Based Neutrino Observatory (INO) facility. We show that the detection capability of tau neutrinos is more than $3 \sigma$ confidence level for a period of 10 years. This analysis was performed by studying the combined sample of tau events...
A promising directional correlation between IceCube muon neutrino candidates
and a catalog of radio-bright blazars has been reported [ApJ 894 (2020) 101,
ApJ 908 (2021) 157]. The analysis presented in this contribution targets the
same radio catalog using the data collected by the ANTARES neutrino telescope
in 13 years of operation. In particular, a search for space and time clustering
of...
Fundamental symmetry such as the Lorentz Invariance (LI) may spontaneously break at Planck scales in some unified theories. In a low energy effective field theory, such as the Standard Model, Violations of LI (VLI) can manifest itself perturbatively. Such Planck-suppressed VLI signals can affect the mass induced neutrino oscillations at accessible energy ranges and induce spectral changes by...
The MAJORANA DEMONSTRATOR experiment is an array of high-purity germanium detectors searching for neutrinoless double-beta decay in $^{76}$Ge. The combined strengths of the MAJORANA experiment and the complementary approach taken by the GERDA experiment have successfully demonstrated the feasibility of the next-generation $^{76}$Ge experiment called LEGEND. The LEGEND program has adopted a new...
The CUPID-Mo experiment, located in the Laboratoire Souterrain de Modane (France) is a demonstrator for the next generation 0νββ experiment CUPID. The experiment is an array of 20 enriched Li$_2$$ ^{100}$MoO$_4$ bolometers and 20 Ge light detectors, working at ~ 20 mK. The experiment has collected data from spring 2019 to summer 2020, for a total exposure of 2.71 kg.yr and set a leading limit...
The BeEST (Beryllium Electron capture in Superconducting Tunnel junctions) experiment searches for keV-scale sterile neutrinos via high precision measurements of eV-scale nuclear recoils and energy-momentum reconstruction method in the electron capture (EC) decay of $^{7}$Be. $^{7}$Be atoms are directly implanted into superconducting tunnel junction (STJ) sensors that can measure the energy of...
The Online Scintillator Internal Radioactivity Investigation System (OSIRIS) is a 20-ton liquid scintillator detector currently under construction at the Jiangmen underground neutrino observatory (JUNO) located at the Kaiping Neutrino Research Center in Kaiping, China. OSIRIS features 75 newly developed, intelligent PMTs (iPMTs) surrounding a cylindrical acrylic vessel embedded in a Cherenkov...
The CUORE (Cryogenic Underground Observatory for Rare Events) experiment is a ton-scale detector $ ^{[1]} $, operating at a cryogenic temperature around 10 mK, searching for neutrinoless double-beta decay of $ ^{130}\rm{Te} $ and other rare events. It owns today's largest milli-Kelvin infrastructure in the world $ ^{[2]} $. We envision an upgrade of the CUORE cryostat in order to host the...
The Liquid Argon (LAr) instrumentation of the neutrinoless double-beta decay experiment LEGEND-200 builds on its precursor [1] operated in the completed GERDA experiment. Thanks to its efficient background recognition capabilities, it was pivotal to search for neutrinoless double-beta decays of $^{76}$Ge quasi-free of background events [2]. An improved version has been developed and is...
Extracting particle physics properties from neutrinoless double-beta (0𝜈𝛽𝛽) decay, requires a detailed understanding of the involved nuclear structures. Still, modern calculations of the corresponding nuclear matrix elements (NMEs) differ by factors 2-3.
The high momentum transfer of Ordinary Muon Capture (OMC) provides insight into highly excited states similar to those that contribute...
Neutrino oscillations are a natural consequence of the fact that the neutrinos have nonzero masses. Until now, most parameters related to the mixing matrix and the neutrino mass differences have been measured with different degrees of precision. In this poster we make a geometrical model for understanding neutrino oscillations and the origin of their mass eigenvalues. In this model, the mixing...
We present the scientific case and R&D status of The Selena Neutrino Experiment. The Selena Neutrino Experiment will consist of imaging sensors made from an ionization target layer of amorphous selenium (aSe) coupled to a silicon complementary metal-oxide-semiconductor (CMOS) active pixel array for charge readout. The high spatial resolution in a solid-state target provides unparalleled...
Neutrino astronomy is among the most promising fields for astro- and particle physics. Measuring astrophysical neutrinos and identifying their sources might shed light on the physics involved in the highest energy objects in the universe. However, measuring elusive neutrinos with large-volume telescopes requires high-precision understanding of the detector and its optical medium. The...
The Short Baseline Neutrino Program aims to discover, or definitely rule out, the existence of sterile neutrinos at the eV mass scale by means of Liquid Argon TPCs along the Booster Neutrino Beamline. In order to mitigate the background induced by cosmic muons, the Far Detector (ICARUS-T600) is instrumented with a 4pi Cosmic Ray Tagging system. The Cosmic Ray Tagging system is composed of...
Thermal MeV neutrino emission from core-collapse supernovae offers a unique opportunity to probe physics beyond the Standard Model in the neutrino sector.
The next generation of neutrino experiments such as DUNE and Hyper-Kamiokande provide can detect over $10^5$ neutrinos in the event of a Galactic supernova. As supernova neutrinos propagate to Earth, they may interact with the local dark...
The main source of systematic uncertainty on neutrino cross section measurements at the GeV scale is represented by the poor knowledge of the initial flux. The goal of cutting down this uncertainty to 1% can be achieved through the monitoring of charged leptons produced in association with neutrinos, by properly instrumenting the decay region of a conventional narrow-band neutrino beam. Large...
NOvA is a long-baseline neutrino experiment studying neutrino oscillations with Fermilab’s NuMI beam. The experiment consists of two functionally identical detectors formed from plastic extrusions filled with a liquid scintillator. Convolution networks have previously been used to determine neutrino flavor in both the near and far detectors and observe the disappearance of muon neutrinos and...
The TRISTAN (TRitium Investigation on STerile to Active Neutrino mixing) detector aims at searching for keV-sterile neutrinos in the full beta decay spectrum of tritium using a novel detector system at the KATRIN experiment.
This detector will consist of more than 1000 Silicon Drift Detector (SDD) pixels, arranged in so-called detector modules. The SDD modules are now in production and the...
The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to determine the effective electron anti-neutrino mass with a sensitivity down to 0.2 eV/c$^2$ (90% CL) through spectroscopy of gaseous tritium beta-decay in the endpoint region. This challenging goal can only be reached through a precise examination of all systematic effects of the experiment. One of these effects is caused by a plasma...
Isomer $^{83m}$Kr of stable $^{83}$Kr emits monoenergetic conversion electrons that represent a unique calibration tool in the KATRIN experiment. In contrast to other monoenergetic electron sources, like electron gun, $^{83m}$Kr as a gas may be homogeneously mixed with tritium. The conversion electrons then undergo similar effects as the β-electrons from tritium decay. It allows for...
Multi-wavelength observations of different core-collapse Supernovae (SNe) have confirmed the presence of dense Circumstellar Material (CSM) around the progenitor star. The CSM is formed as a result of high mass loss of the progenitor star a few years prior to its death. Interaction of this CSM with high energy particles created in supernova explosion can produce secondary particles like high...
