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Neutron lifetime measurement with pulsed cold neutrons
Preprint
K. Hirota ,
G. Ichikawa ,
S. Ieki ,
T. Ino ,
Y. Iwashita ,
M. Kitaguchi ,
R. Kitahara ,
J. Koga ,
K. Mishima ,
A. Morishita ,
N. Nagakura ,
H. Oide ,
H. Okabe ,
H. Otono ,
Y. Seki ,
D. Sekiba ,
T. Shima ,
H. M. Shimizu ,
N. Sumi ,
H. Sumino ,
T. Tomita ,
H. Uehara ,
T. Yamada ,
S. Yamashita ,
M. Yokohashi ,
T. Yoshioka
22 July 2020
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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 of which working gas contains diluted \(^3\)He. The measured neutron lifetime was \(898\,\pm\,10\,_{\rm stat}\,^{+15}_{-18}\,_{\rm sys}\,\)s.