Neutron lifetime measurement with pulsed beam at J- PARC: TPC and DAQ

ORAL

Abstract

The neutron lifetime is an important parameter for Big Bang nucleosynthesis (BBN). The best neutron lifetime measurements have uncertainties at the 0.1\% level; however, they differ by 3.8 sigma. In order to resolve this discrepancy, we plan to measure the neutron lifetime using a method originally developed by Kossakowski et al. which is different from the other 0.1\% accuracy experiments. In our method, which uses a pulsed cold neutron beam at J-PARC, the electrons from the beta decay of the neutron are detected with a time projection chamber (TPC). A small amount of $^{3}$He is added to the gas mixture in order to simultaneously measure the neutron flux. We report on the recent upgrade of the TPC and the Data Acquisition System which were used to take data during the period of February-June 2014.

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Authors

  • 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

  • Naoyukio 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

  • Kenji Mishima

    • KEK

  • Kaoru Taketani

    • KEK

  • Takashi Ino

    • KEK