precise neutron lifetime experiment using pulsed neutron beams at j parc

• DOI: 10.48550/arxiv.1702.03099
• Publication Date: 2017-05-04
• Authors: Hideyuki Oide; Takahito Yamada; S. Ieki; Tomoaki Sugino; T. Tomita; Naoyuki Sumi; Hirohiko M. Shimizu; Takashi Ino; Katsuya Hirota; Yoshichika Seki; Risa Sakakibara; Tatsushi Shima; Naoki Nagakura; A. Morishita; Yoshihisa Iwashita; Satoru Yamashita; Kenji Mishima; Genki Tanaka; Ryunosuke Kitahara; Masaaki Kitaguchi; Kaoru Taketani; Hidetoshi Otono; Hirochika Sumino; Mami Yokohashi; Tamaki Yoshioka
• Keywords: Physics - Instrumentation and Detectors; 0103 physical sciences; FOS: Physical sciences; Instrumentation and Detectors (physics.ins-det); Nuclear Experiment (nucl-ex); Nuclear Experiment; 7. Clean energy; 01 natural sciences

The neutron lifetime 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 the lifetime 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 the lifetime 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.<br/>8 pages, 7 figures, 2 tables, the 26th International Nuclear Physics Conference<br/>