Impact of the ${}^7$Be($\alpha ,\gamma$)${}^{11}$C reaction on the primordial abundance of ${}^7$Li

Abstract

We calculate the radiative capture cross section for ${}^7$Be($\alpha ,\gamma$)${}^{11}$C and its reaction rate of relevance for the big bang nucleosynthesis. The impact of this reaction on the primordial ${}^7$Li abundance is revised including narrow and broad resonances in the pertinent energy region. Our calculations show that it is unlikely that very low energy resonances in ${}^{11}$C of relevance for the big bang nucleosynthesis would emerge within a two-body potential model. Based on our results and a comparison with previous theoretical and experimental analyses, we conclude that the impact of this reaction on the so-called "cosmological lithium puzzle" is completely irrelevant.

arXiv comment12 pages and 3 figures, The Astrophysical Journal, in print

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