$$^{7}$$Be($$n, alpha)^{4}$$He reaction and the cosmological lithium problem; Measurement of the cross section in a wide energy range at n_TOF at CERN
n_TOF実験施設における$$^{7}$$Be($$n, alpha)^{4}$$He反応の広い中性子エネルギーに対する断面積測定とビッグバン・リチウム問題
Barbagallo, M.*; Musumarra, A.*; Cosentino, L.*; Maugeri, E.*; Heinitz, S.*; Mengoni, A.*; Dressler, R.*; Schumann, D.*; K$"a$ppeler, F.*; 原田 秀郎 ; 木村 敦; n_TOF Collaboration*; 他124名*
Barbagallo, M.*; Musumarra, A.*; Cosentino, L.*; Maugeri, E.*; Heinitz, S.*; Mengoni, A.*; Dressler, R.*; Schumann, D.*; K$"a$ppeler, F.*; Harada, Hideo; Kimura, Atsushi; n_TOF Collaboration*; 124 of others*
The energy-dependent cross section of the $$^{7}$$Be($$n, alpha)^{4}$$He reaction, of interest for the so-called cosmological lithium problem in big bang nucleosynthesis, has been measured for the first time from 10 meV to 10 keV neutron energy. Coincidences between the two alpha particles have been recorded in two Si-$$^{7}$$Be-Si arrays placed directly in the neutron beam. The present results are consistent, at thermal neutron energy, with the only previous measurement performed in the 1960s at a nuclear reactor. The energy dependence reported here clearly indicates the inadequacy of the cross section estimates currently used in BBN calculations. Although new measurements at higher neutron energy may still be needed, the n_TOF results hint at a minor role of this reaction in BBN, leaving the long-standing cosmological lithium problem unsolved.
使用言語 : English
掲載資料名 : Physical Review Letters
: 117
: 15
ページ数 : p.152701_1 - 152701_7
発行年月 : 2016/10
出版社名 : American Physical Society
特許データ :
PDF :
論文URL :
キーワード : $$^{7}$$Be($$n, alpha)^{4}$$He; Cross section; n_TOF
使用施設 :
広報プレスリリース :
論文解説記事
(成果普及情報誌)
:
受委託・共同研究相手機関 : n\_TOF Collaboration
 
登録番号 : AA20160339
抄録集掲載番号 : 45000897
論文投稿番号 : 19141
Accesses  (From Jun. 2, 2014)
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パーセンタイル:19.74
分野:Physics, Multidisciplinary
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