中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Experimental Challenge to the Big-Bang Nucleosynthesis - Cosmological Li-7 Problem in BBN -

文献类型:会议论文

作者Kubono, S.1,2,3; Kawabata, T.4; Hou, S. Q.2; He, J. J.5; Cheoun, MK; Hahn, KI; Jeong, S; Kim, SC; Kwak, K; Lee, YS
出版日期2018
卷号1947
DOI10.1063/1.5030814
英文摘要The primordial nucleosynthesis(BBN) right after the big bang (BB) is one of the key elements that basically support the BB model. The BBN is well known that it produced primarily light elements, and explains reasonably most of the elemental abundances. However, there remains an interesting and serious question. That is so called the cosmological Li-7 problem in BBN. The BBN simulations using nuclear data together with the recent detailed micro-wave background measurements explain most of the light elements including D. He-4, etc, but the Li-7 abundance is over predicted roughly by a factor of three. Although this problem should be investigated in all the fields relevant including physics and astronomical observations, I will concentrate my discussion on the nuclear physics side, especially the recent progress for studying the last possible major destruction process of Be-7, the Be-7(n,alpha)He-4 reaction , which would reduce the overproduction if the cross section is large. There are several efforts recently made for the Be-7(n,alpha)He-4 reaction in the world. A new theoretical estimate was made compiling all available data of the mirror reaction Li-7(p,alpha)(4) He, suggesting about one order smaller reaction rate than the ones currently being used (Wagoner rate). The n-TOF group measured some part of the s-wave components of the reaction, suggesting that the s-wave contributions are much smaller than the Wagoner rate. The p-wave component was measured clearly at RCNP, Osaka using the time-reverse reaction He-4(alpha,n)Be-7, indicating that the p-wave contribution dominates at the effective temperature region for the BBN. However. the sum of the s-wave and p-wave contributions is about one order of magnitude smaller than the Wagoner rate. It should be of great interest to confirm by the indirect method. Trojan-Horse method to deduce cross sections at the effective temperature region. and also see the cross sections for a wider energy range systematically, which is under way by the BELICOS project by Livio Lamia and by the CRIB collaboration lead by S. Havakavva.
会议录14TH INTERNATIONAL SYMPOSIUM ON ORIGIN OF MATTER AND EVOLUTION OF GALAXIES (OMEG 2017)
会议录出版者AMER INST PHYSICS
会议录出版地2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
语种英语
资助项目JSPS KAKENHI[JP26287058]
WOS研究方向Astronomy & Astrophysics
WOS记录号WOS:000434142300010
源URL[http://119.78.100.186/handle/113462/57396]  
专题中国科学院近代物理研究所
通讯作者Kubono, S.
作者单位1.RIKEN, Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan
2.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China
3.Univ Tokyo, Ctr Nucl Study, 2-1 Hirosawa, Wako, Saitama 3510198, Japan
4.Kyoto Univ, Dept Phys, Sakyo Ku, Kyoto 6068502, Japan
5.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式
GB/T 7714
Kubono, S.,Kawabata, T.,Hou, S. Q.,et al. Experimental Challenge to the Big-Bang Nucleosynthesis - Cosmological Li-7 Problem in BBN -[C]. 见:.

入库方式: OAI收割

来源:近代物理研究所

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