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 : webmaster@kps.or.kr Copyright(C) KPS, All rights reserved.
30 May 2022 to 4 June 2022
Virtual Seoul
Asia/Seoul timezone

Muon flux and muon-induced neutron yield measurement at China Jinping underground laboratory

Not scheduled
5m
Virtual Seoul

Virtual Seoul

Poster Solar neutrinos Poster

Description

China Jinping Underground Laboratory (CJPL) is ideal for carrying out MeV-scale neutrino experiments and searching for neutrinoless double-beta-decay. To understand the cosmogenic background, we analyzed 820.28 days of the dataset from a one-ton prototype detector and measured the cosmic-ray muon flux to be $(3.61 \pm 0.19_{\rm stat.} \pm 0.10_{\rm sys.}) \times 10^{-10} {\rm cm}^{-2}{\rm s}^{-1}$. From the detected cosmic-ray muon events, we also measured the muon-induced neutron yield in liquid scintillation, which is $ (3.44 \pm 1.86_{\rm stat.} \pm 0.76_{\rm sys.}) \times 10^{-4} \mu^{-1} {\rm g}^{-1}{\rm cm}^2 $ at 340 GeV average energy of muons. In addition, we performed a survey of muon fluxes at different laboratory locations globally, considering both those situated under mountains and those down mine shafts. Under the same vertical overburden, the former is generally $(4 \pm 2)$ times the latter due to the leakage through the mountain. Based on Jinping Mountain's terrain and the measurement in CJPL-I, we predicted cosmic-ray muons' energy and angle distributions and fluxes for the four halls at CJPL-II. We found the fluxes of Hall C and Hall D were about $2.3 \times 10^{-10} {\rm cm}^{-2}{\rm s}^{-1}$ and $2.5 \times 10^{-10} {\rm cm}^{-2}{\rm s}^{-1}$ respectively.

Collaboration Jinping Neutrino Experiment Collaboration

Primary author

bin zhang (Tsinghua Univ.)

Presentation Materials