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Comparative role of the 7Li(n, γ ) reaction in Big Bang nucleosynthesis
Journal of Physics G: Nuclear and Particle Physics ( IF 3.4 ) Pub Date : 2021-03-24 , DOI: 10.1088/1361-6471/abe2b5
N A Burkovа 1 , S B Dubovichenkо 1, 2 , А V Dzhazairov-Kakhramanov 2 , S Z Nurakhmetova 1
Affiliation  

Within the framework of the modified potential cluster model with forbidden states and their classification according to Young diagrams, the possibility of describing experimental data on the total cross sections of the neutron radiative capture on 7Li is considered. It is shown that the model used and the methods for constructing potentials make it possible to correctly describe the behavior of experimental cross sections at energies of 1 meV to 1.5 MeV, where experimental data are available. Based on the calculated total cross sections up to 5 MeV, the reaction rate is calculated and its analytical approximation is carried out. Resonance structure of 7Li(n, γ)8Li cross section and its impact on the reaction rate is examined. It is shown that the 7Li(n, γ)8Li reaction dominates at T 9 < 0.1 as opposed to the burning of 7Li in the 7Li(3H, n)9Be and 7Li(4Нe, γ)11B reactions, but comparable to (d, γ), (d, p), and (p, γ) at T 9 ∼ 1.



中文翻译:

7Li(n, γ ) 反应在大爆炸核合成中的比较作用

在具有禁止状态的修正势簇模型及其根据杨图分类的框架内,考虑了描述7 Li上中子辐射捕获总截面的实验数据的可能性。结果表明,所使用的模型和构造电位的方法可以正确描述能量为 1 meV 到 1.5 MeV 的实验横截面的行为,其中实验数据可用。基于高达 5 MeV 的计算总截面,计算反应速率并进行其解析近似。7 Li( n , γ ) 8 的共振结构检查了 Li 横截面及其对反应速率的影响。结果表明,在7立(Ñγ8个以Li反应占优势Ť 9 <0.1,而不是燃烧7栗在7立(3 H,Ñ9 Be和7的Li(4 Нe,γ11 B 反应,但与T 9 ∼ 1 时的( d , γ )、( d , p ) 和 ( p , γ )相当。

更新日期:2021-03-24
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