TY - JOUR
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. The present results suggest the 7Be(n, α)4 He reaction rate is not large enough to solve the cosmological lithium problem
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. The present results suggest the 7Be(n, α)4 He reaction rate is not large enough to solve the cosmological lithium problem
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U2 - 10.1051/epjconf/201716300028
DO - 10.1051/epjconf/201716300028
M3 - Conference article
AN - SCOPUS:85036662827
VL - 163
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 -