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 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

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

SCI - Physics

Research output: Contribution to journal › Conference article › peer-review

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.

Original language	English
Article number	00028
Journal	EPJ Web of Conferences
Volume	163
DOIs	https://doi.org/10.1051/epjconf/201716300028
Publication status	Published - 2017 Nov 22
Event	FUSION 2017 - Hobart, Australia Duration: 2017 Feb 20 → 2017 Feb 24

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1051/epjconf/201716300028

Cite this

Kawabata, T., Fujikawa, Y., Furuno, T., Goto, T., Hashimoto, T., Ichikawa, M., Itoh, M., Iwasa, N., Kanada-En'Yo, Y., Koshikawa, A., Kubono, S., Miyawaki, E., Mizuno, M., Mizutani, K., Morimoto, T., Murata, M., Nanamura, T., Nishimura, S., Okamoto, S., ... Yoshida, S. (2017). Direct measurement of the ⁷Be(n, α)⁴ He reaction cross sections for the cosmological Li problem. EPJ Web of Conferences, 163, [00028]. https://doi.org/10.1051/epjconf/201716300028

Kawabata, T, Fujikawa, Y, Furuno, T, Goto, T, Hashimoto, T, Ichikawa, M, Itoh, M, Iwasa, N, Kanada-En'Yo, Y, Koshikawa, A, Kubono, S, Miyawaki, E, Mizuno, M, Mizutani, K, Morimoto, T, Murata, M, Nanamura, T, Nishimura, S, Okamoto, S, Sakaguchi, Y, Sakata, I, Sakaue, A, Sawada, R, Shikata, Y, Takahashi, Y, Takechi, D, Takeda, T, Takimoto, C, Tsumura, M, Watanabe, K & Yoshida, S 2017, 'Direct measurement of the ⁷Be(n, α)⁴ He reaction cross sections for the cosmological Li problem', EPJ Web of Conferences, vol. 163, 00028. https://doi.org/10.1051/epjconf/201716300028

@article{000cacb8e5ce46a6870c8b99b3da7916,

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

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.",

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

note = "Funding Information: The present work was performed as a graduation research by the undergraduate senior students at Kyoto University (KADAIKENKYU P4) over the three school years. All the processes of the research project, i.e., planning, development, measurement, and analysis were done by the undergraduate students under the supervision of the faculties. The authors are grateful to RCNP for the deep understanding about the importance of the undergraduate education through the hands-on training at the large accelerator facility. The authors also thank the cyclotron crews at RCNP for their efforts to provide a clean and stable beam, and Prof. T. Wakasa from Kyushu University for his kind support to carry out the present measurement at the neutron time-of-flight facility. This work was supported by JSPS KAKENHI Grant Numbers JP26287058 and JP15H02091. Publisher Copyright: {\textcopyright} The Authors, published by EDP Sciences, 2017.; FUSION 2017 ; Conference date: 20-02-2017 Through 24-02-2017",

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doi = "10.1051/epjconf/201716300028",

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T1 - Direct measurement of the 7Be(n, α)4 He reaction cross sections for the cosmological Li problem

AU - Kawabata, Takahiro

AU - Fujikawa, Yuki

AU - Furuno, Tatsuya

AU - Goto, Tatsuya

AU - Hashimoto, Toshikazu

AU - Ichikawa, Masaya

AU - Itoh, Makoto

AU - Iwasa, Naohito

AU - Kanada-En'Yo, Yoshiko

AU - Koshikawa, Ami

AU - Kubono, Shigeru

AU - Miyawaki, Eisuke

AU - Mizuno, Masatoshi

AU - Mizutani, Keigo

AU - Morimoto, Takahiro

AU - Murata, Motoki

AU - Nanamura, Takuya

AU - Nishimura, Shunji

AU - Okamoto, Shintaro

AU - Sakaguchi, Yuichi

AU - Sakata, Itsushi

AU - Sakaue, Akane

AU - Sawada, Ryo

AU - Shikata, Yuki

AU - Takahashi, Yu

AU - Takechi, Daiki

AU - Takeda, Tomoya

AU - Takimoto, Chisato

AU - Tsumura, Miho

AU - Watanabe, Ken

AU - Yoshida, Sota

N1 - Funding Information: The present work was performed as a graduation research by the undergraduate senior students at Kyoto University (KADAIKENKYU P4) over the three school years. All the processes of the research project, i.e., planning, development, measurement, and analysis were done by the undergraduate students under the supervision of the faculties. The authors are grateful to RCNP for the deep understanding about the importance of the undergraduate education through the hands-on training at the large accelerator facility. The authors also thank the cyclotron crews at RCNP for their efforts to provide a clean and stable beam, and Prof. T. Wakasa from Kyushu University for his kind support to carry out the present measurement at the neutron time-of-flight facility. This work was supported by JSPS KAKENHI Grant Numbers JP26287058 and JP15H02091. Publisher Copyright: © The Authors, published by EDP Sciences, 2017.

PY - 2017/11/22

Y1 - 2017/11/22

N2 - 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.

AB - 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.

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U2 - 10.1051/epjconf/201716300028

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JO - EPJ Web of Conferences

JF - EPJ Web of Conferences

SN - 2101-6275

M1 - 00028

T2 - FUSION 2017

Y2 - 20 February 2017 through 24 February 2017

ER -

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

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