Experimental study of the Γp1/ Γp0 ratios of resonance states in Be 8 for deducing the Be 7 (n,p1) Li ∗ 7 reaction rate relevant to the cosmological lithium problem

N. Iwasa, S. Ishikawa, S. Kubono, T. Sakakibara, K. Kominato, K. Nishio, M. Matsuda, K. Hirose, H. Makii, R. Orlandi, K. Asada, D. Guru, S. Nishimura, S. Hayakawa, T. Kawabata

Research output: Contribution to journalArticlepeer-review

Abstract

The Be9(He3,α)Be∗8(p)Li7 reaction was studied at Elab(3He)=30 MeV to deduce the branching ratios of Γp1/Γp0 of resonant states at 18.91-20.1MeV in Be8, which are necessary to extract the Be7(n,p1)Li∗7 reaction rate relevant to the Be7 destruction in the big bang nucleosynthesis, from the Li7(p,n0)Be7 reaction cross section. The decay protons from Be∗8 to the ground and first excited states in Li7 were well-separately measured. The Γp1/Γp0 ratio of the 19.235-MeV state was deduced to be 3.4±1.9 %. The 19.86- and 20.1-MeV states were found to decay dominantly into the first excited and ground states of Li7, respectively.

Original languageEnglish
Article number015801
JournalPhysical Review C
Volume103
Issue number1
DOIs
Publication statusPublished - 2021 Jan 6

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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