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Experimental determination of the resonance width and the branching ratio $$Gamma_{p1}$$/$$Gamma_{p0}$$ for the 19.40-MeV state in $$^{8}$$Be for studying the $$^{7}$$Be($$n$$,$$p1$$)$$^{7}$$Li$$^{*}$$ reaction relevant to the cosmological lithium problem

岩佐 直仁*; 西尾 勝久   ; 廣瀬 健太郎  ; 牧井 宏之   ; Orlandi, R.   ; 洲嵜 ふみ  ; Smallcombe, J. ; 他7名*

Iwasa, Naohito*; Nishio, Katsuhisa; Hirose, Kentaro; Makii, Hiroyuki; Orlandi, R.; Suzaki, Fumi; Smallcombe, J.; 7 of others*

The $$^{7}$$Li($$^{3}$$He,$$d$$)$$^{8}$$Be$$^{*}$$($$p$$)$$^{7}$$Li reaction was measured at $$E_{lab}$$($$^{3}$$He) = 28 MeV for studying the $$^{7}$$Be($$n$$,$$p1$$)$$^{7}$$Li$$^{*}$$ reaction, which is a $$^{7}$$Be destruction reaction in the big bang nucleosynthesis. Resonant states at 18.9$$-$$20.1 MeV in $$^{8}$$Be were populated by the $$^{7}$$Li($$^{3}$$He,$$d$$)$$^{8}$$Be$$^{*}$$ reaction and decay protons to the ground ($$p0$$) and first-excited states ($$p1$$) in $$^{7}$$Li were well separated and measured. The resonance width $$Gamma$$ and branching ratio $$Gamma_{p1}$$/$$Gamma_{p0}$$ for the 19.40-MeV state in $$^{8}$$Be were deduced to be 342$$pm$$112 keV and 11.2 $$pm$$ 3.5 $$pm$$ 5.0 (syst.)%, respectively. The $$7$$Be($$n$$,$$p1$$)$$^{7}$$Li$$^{*}$$ reaction cross section was deduced.

発表言語

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English

掲載資料名

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Physical Review C

巻

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112

号

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3

ページ数

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p.035801_1 - 035801_6

発行年月

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2025/09

発表会議名

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開催年月

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開催都市

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開催国

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キーワード

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宇宙リチウム問題; 共鳴; $$^{8}$$Be

特許データ

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PDF

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論文URL

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https://doi.org/10.1103/jhgx-cht5

研究データの公開先DOI

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本成果にかかわる研究データのリンクです。

使用施設

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タンデム加速器  

広報プレスリリース

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論文解説
(JAEA R&D Navigator)

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受委託・共同研究相手機関

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Access

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- Accesses

InCites™

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パーセンタイル：67.88

分野：Physics, Nuclear

Altmetrics

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