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; Takuya Nanamura; Shintaro Okamoto; Yuichi Sakaguchi; Itsushi Sakata; Akane Sakaue; Ryo Sawada; Yuki Shikata; Yu Takahashi; Daiki Takechi; Tomoya Takeda; Chisato Takimoto; Miho Tsumura; Ken Watanabe; Sota Yoshida

doi:10.1051/epjconf/201716300028

All issues

Volume 163 (2017)

EPJ Web Conf., 163 (2017) 00028

Abstract

Open Access

Issue		EPJ Web Conf. Volume 163, 2017 FUSION17


Article Number		00028
Number of page(s)		5
DOI		https://doi.org/10.1051/epjconf/201716300028
Published online		22 November 2017

E3S Web of Conferences 163, 00028 (2017)
https://doi.org/10.1051/epjconf/201716300028

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

Takahiro Kawabata¹^*, Yuki Fujikawa², Tatsuya Furuno¹, Tatsuya Goto², Toshikazu Hashimoto¹, Masaya Ichikawa¹, Makoto Itoh¹, Naohito Iwasa³, Yoshiko Kanada-En'yo¹, Ami Koshikawa¹^,2, Shigeru Kubono⁴, Eisuke Miyawaki², Masatoshi Mizuno², Keigo Mizutani¹, Takahiro Morimoto¹^,2, Motoki Murata¹, Takuya Nanamura¹^,2, Shunji Nishimura⁴, Takuya Nanamura¹^,2, Shintaro Okamoto², Yuichi Sakaguchi², Itsushi Sakata², Akane Sakaue¹, Ryo Sawada², Yuki Shikata², Yu Takahashi², Daiki Takechi², Tomoya Takeda², Chisato Takimoto², Miho Tsumura¹, Ken Watanabe² and Sota Yoshida²

¹ Department of Physics, Kyoto University, Kitashirakawa-Oiwake, Sakyo, Kyoto 606-8502, Japan
² Faculty of Science, Kyoto University, Kitashirakawa-Oiwake, Sakyo, Kyoto 606-8502, Japan
³ Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan
⁴ RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

^* e-mail: kawabata@scphys.kyoto-u.ac.jp

Published online: 22 November 2017

Abstract

The cross sections of the ⁷Be(n, α)⁴He reaction for p-wave neutrons were experimentally determined at E_c.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

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).

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