Neutron lifetime experiment with pulsed cold neutrons at J-PARC

Go Ichikawa, Yasuhiro Fuwa, Takuro Hasegawa, Masahiro Hino, Katsuya Hirota, Takashi Ino, Yoshihisa Iwashita, Masaaki Kitaguchi, Jun Koga, Shun Matsuzaki, Kenji Mishima, Takanori Mogi, Koki Morikawa, Hiroki Okabe, Hidetoshi Otono, Yoshichika Seki, Daiichiro Sekiba, Tatsushi Shima, Haruki Shimizu, Hirohiko ShimizuNaoyuki Sumi, Hirochika Sumino, Satoru Yamashita, Kodai Yano, Tamaki Yoshioka

Research output: Contribution to journalConference articlepeer-review

Abstract

A free neutron decays in a lifetime of about 880 s. Although the neutron lifetime is an important parameter in modern physics, there is a 4.6σ (9.5 s) discrepancy between the experimental results of two typical methods: the beam method and the storage method. We are carrying out a new experimental method to measure the neutron lifetime using a pulsed neutron beam at J-PARC MLF BL05 to determine the cause of the discrepancy, whether overlooked systematic uncertainties or new physics. A review of our experiment including the first physics result with acquired data during 2014 - 2016 and the status using new neutron optics are presented here.

Original languageEnglish
Article number457
JournalProceedings of Science
Volume380
Publication statusPublished - May 24 2022
Event22nd Particles and Nuclei International Conference, PANIC 2021 - Virtual, Online, Portugal
Duration: Sep 5 2021Sep 10 2021

All Science Journal Classification (ASJC) codes

  • General

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