Precise neutron lifetime experiment using pulsed neutron beams at J-PARC

Naoki Nagakura, Katsuya Hirota, Sei Ieki, Takashi Ino, Yoshihisa Iwashita, Masaaki Kitaguchi, Ryunosuke Kitahara, Kenji Mishima, Aya Morishita, Hideyuki Oide, Hidetoshi Otono, Risa Sakakibara, Yoshichika Seki, Tatsushi Shima, Hirohiko M. Shimizu, Tomoaki Sugino, Naoyuki Sumi, Hirochika Sumino, Kaoru Taketani, Genki TanakaTatsuhiko Tomita, Takahito Yamada, Satoru Yamashita, Mami Yokohashi, Tamaki Yoshioka

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


The neutron lifetime (τn) is one of the basic parameters in the weak interaction, and is used for predicting the light element abundance in the early universe. Our group developed a new setup to measure τn with the goal precision of 0.1% at the polarized beam branch BL05 of MLF, J-PARC. The commissioning data was acquired in 2014 and 2015, and the first set of data to evaluate τn in 2016, which is expected to yield a statistical uncertainty of O(1)%. This paper presents the current analysis results and the future plans to achieve our goal precision.

Original languageEnglish
Article number191
JournalProceedings of Science
Publication statusPublished - 2016
Event26th International Nuclear Physics Conference, INPC 2016 - Adelaide, Australia
Duration: Sept 11 2016Sept 16 2016

All Science Journal Classification (ASJC) codes

  • General


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