3He(α,γ)7Be and 3H(α,γ)7Li reaction rates and implication for Big Bang nucleosynthesis in the potential model

Abstract

The reaction rates of the direct astrophysical capture processes [Formula: see text] and [Formula: see text], as well as the abundance of the [Formula: see text] element are estimated in the framework of a two-body potential model. The estimated [Formula: see text] abundance ratio of [Formula: see text] is in a very good agreement with the recent measurement [Formula: see text] of the LUNA collaboration.

Analysis of the $^{3}{\rm He}(α, γ)^{7}{\rm Be}$ and $^{3}{\rm H}(α,γ)^{7}{\rm Li}$ astrophysical direct capture reactions in a modified potential-model approach

“…In Table III estimated values for the reaction rate are given for the 3 He(α, γ) 7 Be direct capture process in the temperature interval 10 6 K ≤ T ≤ 10 9 K (0.001 ≤ T 9 ≤ 1). From the values presented in the table one can conclude that the numerical results for the models V n D and V n M 1 are in a good agreement with those obtained using the models V a D and V a M 1 [50], respectively.…”

“…Li capture processes into the nuclear reaction network with the help of the PArthENoPE[54] code, we can evaluate the primordial abundance of the 7 Li element.Adopting the aforementioned values of the baryon density and the neutron life time, for the7 Li/H abundance ratio we have an estimate (4.936 ± 0.129) × 10 −10 within the model V n D , while the model V n M 1 yields (4.835 ± 0.127) × 10 −10[50]. These numbers are slightly different than the corresponding estimates based exclusively on the 3 He(α, γ)7 Be process.…”