TY - JOUR
T1 - Measurement of γ rays from 6LiF tile as an inner wall of a neutron-decay detector
AU - Koga, J.
AU - Ieki, S.
AU - Kimura, A.
AU - Kitaguchi, M.
AU - Kitahara, R.
AU - Mishima, K.
AU - Nagakura, N.
AU - Okudaira, T.
AU - Otono, H.
AU - Shimizu, H. M.
AU - Sumi, N.
AU - Takada, S.
AU - Tomita, T.
AU - Yamada, T.
AU - Yoshioka, T.
N1 - Publisher Copyright:
© 2021 The Author(s).
PY - 2021/2/1
Y1 - 2021/2/1
N2 - A neutron lifetime measurement conducted at the Japan Proton Accelerator Research Complex (J-PARC) is counting the number of electrons from neutron decays with a time projection chamber (TPC). The γ rays produced in the TPC cause irreducible background events. To achieve the precise measurement, the inner walls of the TPC consist of 6Li-enriched lithium-fluoride (6LiF) tiles to suppress the amount of γ rays. In order to estimate the amount of γ rays from the 6LiF tile, prompt gamma ray analysis (PGA) measurements were performed using germanium detectors. We reconstructed the measured γ-ray energy spectrum using a Monte Carlo simulation with the stripping method. Comparing the measured spectrum with a simulated one, the number of γ rays emitted from the6LiF tile was (2.3+0.7-0.3) × 10-4 per incident neutron. This is 1.4+0.5-0.2 times the value assumed for a mole fraction of the 6LiF tile. We concluded that the amount of γ rays produced from the 6LiF tile is not more twice the originally assumed value.
AB - A neutron lifetime measurement conducted at the Japan Proton Accelerator Research Complex (J-PARC) is counting the number of electrons from neutron decays with a time projection chamber (TPC). The γ rays produced in the TPC cause irreducible background events. To achieve the precise measurement, the inner walls of the TPC consist of 6Li-enriched lithium-fluoride (6LiF) tiles to suppress the amount of γ rays. In order to estimate the amount of γ rays from the 6LiF tile, prompt gamma ray analysis (PGA) measurements were performed using germanium detectors. We reconstructed the measured γ-ray energy spectrum using a Monte Carlo simulation with the stripping method. Comparing the measured spectrum with a simulated one, the number of γ rays emitted from the6LiF tile was (2.3+0.7-0.3) × 10-4 per incident neutron. This is 1.4+0.5-0.2 times the value assumed for a mole fraction of the 6LiF tile. We concluded that the amount of γ rays produced from the 6LiF tile is not more twice the originally assumed value.
KW - Detector design and construction technologies and materials
KW - Materials for gaseous detectors
KW - Neutron detectors (cold, thermal, fast neutrons)
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U2 - 10.1088/1748-0221/16/02/P02001
DO - 10.1088/1748-0221/16/02/P02001
M3 - Article
AN - SCOPUS:85101720663
SN - 1748-0221
VL - 16
JO - Journal of Instrumentation
JF - Journal of Instrumentation
IS - 2
M1 - P02001
ER -