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Experimental study of the $$Gamma_{p1}/Gamma_{p0}$$ ratios of resonance states in $$^{8}$$Be for deducing the $$^{7}$$Be($$n$$,$$p_{1}$$)$$^{7}$$Li$$^{*}$$ reaction rate relevant to the cosmological lithium problem

Iwasa, Naohito*; Ishikawa, Shunki*; Kubono, Shigeru*; Sakakibara, T.*; Kominato, Kazuya*; Nishio, Katsuhisa   ; Matsuda, Makoto  ; Hirose, Kentaro  ; Makii, Hiroyuki   ; Orlandi, R.  ; Asada, K.*; Guru, D.*; Nishimura, Shunji*; Hayakawa, Seiya*; Kawabata, Takahiro*

The $$^{9}$$Be($$^{3}$$He,$$alpha$$)$$^{8}$$Be($$p$$)$$^{7}$$Li reaction was studied at $$E_{rm lab}$$($$^{3}$$He)=30 MeV to deduce the branching ratios of $$Gamma_{p1}/Gamma_{p0}$$ of resonant state at 18.91 - 20.1 MeV in $$^{8}$$Be, which are necessary to extract the $$^{7}$$Be($$n$$, $$p_{1}$$)$$^{7}$$Li$$^{*}$$ reaction rate relevant to the $$^{7}$$Be destruction in the big bang nucleosynthesis, from the $$^{7}$$Li($$p$$,$$n_{0}$$)$$^{7}$$Be reaction cross section. The decay protons from $$^{8}$$Be$$^{*}$$ to the ground and first excited states in $$^{7}$$Li were well-separately measured. The $$Gamma_{p1}/Gamma_{p0}$$ ratio of the 19.235-MeV state was deduced to be 3.4$$pm$$1.9%. The 19.86- and 20.1-MeV states were found to decay dominantly into the first excited and ground states of $$^{7}$$Li, respectively.

Language

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English

Journal

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Physical Review C

Volume

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103

Number

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1

Pages

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p.015801_1 - 015801_5

Publication Year/Month

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2021/01

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Held date

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Patent information

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PDF

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Paper URL

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https://doi.org/10.1103/PhysRevC.103.015801

DOI for research data

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Keywords

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宇宙リチウム問題; 天体核反応; 磁気スペクトログラフ

Research Facility

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タンデム加速器  

Press Release

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Article of JAEA R&D Review

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Cooperating Institute

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Accesses

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- Accesses

InCites™

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Percentile:18.91

Category:Physics, Nuclear

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