The Korean Physical Society 06130 22, Teheran-ro 7-gil, Gangnam-gu, Seoul, Republic of Korea 610 Representation : Tae Won NOH TEL: 02-556-4737 FAX: 02-554-1643 E-mail : Copyright(C) KPS, All rights reserved.
30 May 2022 to 4 June 2022
Virtual Seoul
Asia/Seoul timezone

On-site background measurement for Decay at Rest νe + Pb Cross Section Measurement: DaRveX

Not scheduled
Virtual Seoul

Virtual Seoul

Poster Neutrino interactions Poster


DaRveX isan abbreviation of "Decay at Rest nue+Pb Cross(X) section measurement".
Until now, no good detection method for electron neutrino (${\nu_e}$) in MeV energy region has been developed although there are interesting physics channels in the low energy $\nu_{e}$ such as measurement of supernova, neutrino oscillation and $\nu_e-$nucleus interactions. Lead (Pb) has a novel potential as the target of the low energy $\nu_{e}$ since the cross section is expected to be very large and the delayed coincidence method is available to reduce the backgrounds.
The mercury proton beam target in J-PARC/MLF is a great source of neutrinos. A number of $\pi^+$ are created in the target, and they decay to $\mu^+$. The $\mu^+$ soon stops in the target and then decays to $\nu_e$. We are preparing measurement of the “Decay at Rest $\nu_e$” in the MLF experiment area using plastic scintillator-based detector with lead planes.
Neutron and gamma ray related to the beam collision are major backgrounds of the $\nu_e$ measurement since they are synchronized with $\nu_e$ timing. We have performed an onsite-background measurement in the MLF experiment area in the summer of 2021 and observed high background level for the neutrino measurement. Then we plan to measure the effectiveness of background shields we are designing (Boron shields for thermal neutron and thick lead shields for gamma-rays) making use of the real backgrounds. in spring of 2022. We are also developing the neutrino detector aiming to start the data taking in 2023.
In this presentation, we report the results of the background measurement and plan of the neutrino observation.

Primary authors

Yota Hino (Okayama University) Yuka Hoshino (Kitasato University) Naoyuki Kadota (Research Center for Neutrino Science, Tohoku University) Takeo Kawasaki (Kitasato University) Takahito Tokuraku (Research Center for Neutrino Science, Tohoku University) Fumihiko Suekane (Research Center for Neutrino Science, Tohoku University) Masaya Watanabe (Kitasato University)

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