Neutron lifetime measurement with pulsed cold neutrons. (4th December 2020)

• Record Type: Journal Article
• Authors: Hirota, K; Ichikawa, G; Ieki, S; Ino, T; Iwashita, Y; Kitaguchi, M; Kitahara, R; Koga, J; Mishima, K; Mogi, T; Morikawa, K; Morishita, A; Nagakura, N; Oide, H; Okabe, H; Otono, H; Seki, Y; Sekiba, D; Shima, T; Shimizu, H M; Sumi, N; Sumino, H; Tomita, T; Uehara, H; Yamada, T; Yamashita, S; Yano, K; Yokohashi, M; Yoshioka, T
• Is Part Of: Progress of theoretical and experimental physics. Volume 2020:Number 12(2020)
• Publication Date: 2020-12-04
• Subjects: C02 -- C30 -- D02 -- D40; Physics -- Periodicals; Mathematical physics -- Periodicals; 530.05
• DOI: 10.1093/ptep/ptaa169
• Languages: English
• ISSNs: 2050-3911

Abstract

Abstract: The neutron lifetime has been measured by comparing the decay rate with the reaction rate of $^3$ He nuclei of a pulsed neutron beam from the spallation neutron source at the Japan Proton Accelerator Research Complex (J-PARC). The decay rate and the reaction rate were determined by simultaneously detecting electrons from the neutron decay and protons from the $^3$ He(n, p)$^3$ H reaction using a gas chamber, the working gas of which contains diluted $^3$ He. The measured neutron lifetime was $898\, \pm\, 10\, _{\rm stat}\, ^{+15}_{-18}\, _{\rm sys}\, $ s.