New project for precise neutron lifetime measurement at J-PARC Naoki Nagakura, Katsuya Hirota, Sei Ieki, Takashi Ino, Yoshihisa Iwashita, Masaaki Kitaguchi, Ryunosuke Kitahara, Jun Koga, Kenji Mishima, Aya Morishita et al. (17 more) EPJ Web Conf., 219 (2019) 03003 Published online: 12 December 2019 DOI: 10.1051/epjconf/201921903003