Revised thermonuclear rate of Be-7(n, alpha)He-4 relevant to Big-Bang nucleosynthesis

doi:10.1103/PhysRevC.91.055802

	Revised thermonuclear rate of Be-7(n, alpha)He-4 relevant to Big-Bang nucleosynthesis
	Hou, S. Q.1,2,3; He, J. J.1,2; Kubono, S.1,2,4; Chen, Y. S.5
刊名	PHYSICAL REVIEW C
	2015-05-08
卷号	91
ISSN号	0556-2813
DOI	10.1103/PhysRevC.91.055802
文献子类	Article
英文摘要	In the standard Big-Bang nucleosynthesis (BBN) model, the primordial Li-7 abundance is overestimated by about a factor of 2 to 3 compared to astronomical observations; this is the so-called pending cosmological lithium problem. The Be-7(n,alpha)He-4 reaction was regarded as the secondary important reaction in affecting the Li-7 abundance by destructing the Be-7 nucleus in BBN. However, the reaction rate of Be-7(n,alpha)He-4 has not been well studied so far. This reaction rate was first estimated by Wagoner in 1969, which has been primarily adopted in the current BBN simulations. This simple estimate involved only a direct reaction contribution, but the resonant component should also be considered according to the later experimental results. In the present work, we revised this rate based on the indirect cross-section data available for the He-4(alpha,n)Be-7 and He-4(alpha,p)Li-7 reactions by applying the charge symmetry and the principle of detailed balance. Our new result shows that the previous rate (acting as an upper limit) is overestimated by about a factor of ten. The BBN simulation shows that the present rate leads to a 1.2% increase in the final Li-7 abundance compared with the result using the Wagoner rate and, hence, the present rate even worsens the Li-7 problem. By the present estimation, the role of Be-7(n,alpha)He-4 in destroying Be-7 is weakened from the second most importance to the third and, in turn, the Be-7(d,p)2(4)He reaction becomes of secondary importance in destroying Be-7.
资助项目	JSPS KAKENHI in Japan[26287058]
WOS关键词	ANISOTROPY-PROBE OBSERVATIONS ; R-MATRIX ANALYSIS ; PRIMORDIAL NUCLEOSYNTHESIS ; WMAP ; COMPILATION ; ABUNDANCE ; ELEMENTS ; LIGHT ; LI-7
WOS研究方向	Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000354250700003
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/47841]
专题	中国科学院近代物理研究所
通讯作者	Hou, S. Q.
作者单位	1.Chinese Acad Sci, Inst Modern Phys, Key Lab High Precis Nucl Spect, Lanzhou 730000, Peoples R China 2.Chinese Acad Sci, Inst Modern Phys, Ctr Nucl Matter Sci, Lanzhou 730000, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.RIKEN, Nishina Ctr, Wako, Saitama 3510198, Japan 5.China Inst Atom Energy, Beijing 102413, Peoples R China
推荐引用方式 GB/T 7714	Hou, S. Q.,He, J. J.,Kubono, S.,et al. Revised thermonuclear rate of Be-7(n, alpha)He-4 relevant to Big-Bang nucleosynthesis[J]. PHYSICAL REVIEW C,2015,91.
APA	Hou, S. Q.,He, J. J.,Kubono, S.,&Chen, Y. S..(2015).Revised thermonuclear rate of Be-7(n, alpha)He-4 relevant to Big-Bang nucleosynthesis.PHYSICAL REVIEW C,91.
MLA	Hou, S. Q.,et al."Revised thermonuclear rate of Be-7(n, alpha)He-4 relevant to Big-Bang nucleosynthesis".PHYSICAL REVIEW C 91(2015).