Direct measurement of the 7Be(n, α)4 He reaction cross sections for the cosmological Li problem

Takahiro Kawabata, Yuki Fujikawa, Tatsuya Furuno, Tatsuya Goto, Toshikazu Hashimoto, Masaya Ichikawa, Makoto Itoh, Naohito Iwasa, Yoshiko Kanada-En'Yo, Ami Koshikawa, Shigeru Kubono, Eisuke Miyawaki, Masatoshi Mizuno, Keigo Mizutani, Takahiro Morimoto, Motoki Murata, Takuya Nanamura, Shunji Nishimura, Shintaro Okamoto, Yuichi SakaguchiItsushi Sakata, Akane Sakaue, Ryo Sawada, Yuki Shikata, Yu Takahashi, Daiki Takechi, Tomoya Takeda, Chisato Takimoto, Miho Tsumura, Ken Watanabe, Sota Yoshida

Research output: Contribution to journalConference articlepeer-review

Abstract

The cross sections of the 7Be(n, α)4He reaction for p-wave neutrons were experimentally determined at Ec.m. = 0.20-0.81 MeV close to the Big Bang nucleosynthesis (BBN) energy window for the first time on the basis of the detailed balance principle by measuring the time-reverse reaction. The obtained cross sections are much larger than the cross sections for s-wave neutrons inferred from the recent measurement at the n-TOF facility in CERN, but significantly smaller than the theoretical estimation widely used in the BBN calculations. The present results suggest the 7Be(n, α)4 He reaction rate is not large enough to solve the cosmological lithium problem

Original languageEnglish
Article number00028
JournalEPJ Web of Conferences
Volume163
DOIs
Publication statusPublished - 2017 Nov 22
EventFUSION 2017 - Hobart, Australia
Duration: 2017 Feb 202017 Feb 24

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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