EPJ Web of Conferences (Jan 2017)
Direct measurement of the 7Be(n, α)4 He reaction cross sections for the cosmological Li problem
- Kawabata Takahiro,
- Fujikawa Yuki,
- Furuno Tatsuya,
- Goto Tatsuya,
- Hashimoto Toshikazu,
- Ichikawa Masaya,
- Itoh Makoto,
- Iwasa Naohito,
- Kanada-En'yo Yoshiko,
- Koshikawa Ami,
- Kubono Shigeru,
- Miyawaki Eisuke,
- Mizuno Masatoshi,
- Mizutani Keigo,
- Morimoto Takahiro,
- Murata Motoki,
- Nanamura Takuya,
- Nishimura Shunji,
- Nanamura Takuya,
- Okamoto Shintaro,
- Sakaguchi Yuichi,
- Sakata Itsushi,
- Sakaue Akane,
- Sawada Ryo,
- Shikata Yuki,
- Takahashi Yu,
- Takechi Daiki,
- Takeda Tomoya,
- Takimoto Chisato,
- Tsumura Miho,
- Watanabe Ken,
- Yoshida Sota
Affiliations
- Kawabata Takahiro
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake
- Fujikawa Yuki
- Faculty of Science, Kyoto University, Kitashirakawa-Oiwake
- Furuno Tatsuya
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake
- Goto Tatsuya
- Faculty of Science, Kyoto University, Kitashirakawa-Oiwake
- Hashimoto Toshikazu
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake
- Ichikawa Masaya
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake
- Itoh Makoto
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake
- Iwasa Naohito
- Department of Physics, Tohoku University, Aoba
- Kanada-En'yo Yoshiko
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake
- Koshikawa Ami
- Kubono Shigeru
- RIKEN Nishina Center, RIKEN
- Miyawaki Eisuke
- Faculty of Science, Kyoto University, Kitashirakawa-Oiwake
- Mizuno Masatoshi
- Faculty of Science, Kyoto University, Kitashirakawa-Oiwake
- Mizutani Keigo
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake
- Morimoto Takahiro
- Murata Motoki
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake
- Nanamura Takuya
- Nishimura Shunji
- RIKEN Nishina Center, RIKEN
- Nanamura Takuya
- Okamoto Shintaro
- Faculty of Science, Kyoto University, Kitashirakawa-Oiwake
- Sakaguchi Yuichi
- Faculty of Science, Kyoto University, Kitashirakawa-Oiwake
- Sakata Itsushi
- Faculty of Science, Kyoto University, Kitashirakawa-Oiwake
- Sakaue Akane
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake
- Sawada Ryo
- Faculty of Science, Kyoto University, Kitashirakawa-Oiwake
- Shikata Yuki
- Faculty of Science, Kyoto University, Kitashirakawa-Oiwake
- Takahashi Yu
- Faculty of Science, Kyoto University, Kitashirakawa-Oiwake
- Takechi Daiki
- Faculty of Science, Kyoto University, Kitashirakawa-Oiwake
- Takeda Tomoya
- Faculty of Science, Kyoto University, Kitashirakawa-Oiwake
- Takimoto Chisato
- Faculty of Science, Kyoto University, Kitashirakawa-Oiwake
- Tsumura Miho
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake
- Watanabe Ken
- Faculty of Science, Kyoto University, Kitashirakawa-Oiwake
- Yoshida Sota
- Faculty of Science, Kyoto University, Kitashirakawa-Oiwake
- DOI
- https://doi.org/10.1051/epjconf/201716300028
- Journal volume & issue
-
Vol. 163
p. 00028
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
