Neutron lifetime measurement with pulsed beam at JPARC: Overview

ORAL

Abstract

The neutron lifetime is an important parameter for a test of the Standard Model of elementary particles, as well for the production of light mass nuclei in big bang nucleosynthesis. There are two principally different approaches to measure the neutron lifetime: In-beam methods and storage of ultracold neutron. At present, there is a discrepancy of 8.4 sec (3.8 sigma) between the two methods. We are performing a new In-beam experiment with an intense pulsed neutron source at J-PARC, which has different systematic uncertainties from the previous experiments. We introduce the overview of the experiment and report present status.

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Authors

  • Kenji Mishima

    • KEK

  • Takashi Ino

    • KEK

  • Kaoru Taketani

    • KEK

  • Takahito Yamada

    • The University of Tokyo

  • Ryo Katayama

    • The University of Tokyo

  • Nao Higashi

    • The University of Tokyo

  • Harumichi Yokoyama

    • The University of Tokyo

  • Hirochika Sumino

    • The University of Tokyo

  • Satoru Yamashita

    • The University of Tokyo

  • Risa Sakakibara

    • Nagoya University

  • Tomoaki Sugino

    • Nagoya University

  • Masaaki Kitaguchi

    • Nagoya University

  • Katsuya Hirota

    • Nagoya University

  • Hirohiko M. Shimizu

    • Nagoya University

  • Genki Tanaka

    • Kyushu University

  • Naoyuki Sumi

    • Kyushu University

  • Hidetoshi Otono

    • Kyushu University

  • Tamaki Yoshioka

    • Kyushu University

  • Ryunosuke Kitahara

    • Kyoto University

  • Yoshihisa Iwashita

    • Kyoto University

  • Hideyuki Oide

    • CERN

  • Tatsushi Shima

    • Osaka University

  • Yoshichika Seki

    • RIKEN