Study of the contribution of the 7Be(d, p) reaction to the 7Li problem in the Big-Bang Nucleosynthesis

Azusa Inoue, Atsushi Tamii, Phaikying Chan, Seiya Hayakawa, Nobuyuki Kobayashi, Yukie Maeda, Kotaro Nonaka, Tatsushi Shima, Hideki Shimizu, Dinh Trong Tran, Xuan Wang, Hidetoshi Yamaguchi, Lei Yang, Zaihong Yang

Research output: Contribution to journalConference articlepeer-review


Our research goal is to measure the cross section of the 7Be(d, p) reaction to find a solution for the cosmological the 7Li problem, which is an overestimation of the primordial 7Li abundance in the standard Big-Bang nucleosynthesis (BBN) model. We developed a method to produce an unstable 7Be target to measure the reaction in normal kinematics in a high-resolution measurement. We performed an experiment to produce the 7Be target and also to measure the cross section of the 7Be(d, p)8Be reaction with the produced 7Be target at the tandem facility, Kobe University. A 2.36 MeV proton beam irradiated a Li target to transmute 7Li particles to 7Be particles via the 7Li(p, n)7Be reaction. We produced 2.6 1013 7Be particles in the target after two days' proton irradiation. After the target production, the beam ion was changed to deuterons with energies of 0.6, 1.0, and 1.6 MeV to measure the 7Be(d, p) reaction. The outgoing protons were measured by two ΔE-E silicon telescopes placed at 30 and 45 . We report the preliminary results of this experiment, including the 7Be(d, p) cross section.

Original languageEnglish
Article number012049
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2020 Dec 23
Externally publishedYes
Event27th International Nuclear Physics Conference, INPC 2019 - Glasgow, United Kingdom
Duration: 2019 Jul 292019 Aug 2

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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