Solving the large discrepancy between inclusive and exclusive measurements of the ${}^8\mathrm{Li}+{}^4\mathrm{He}\to {}^{11}\mathrm{B}+n$ reaction cross section at astrophysical energies

Abstract

A solution of the large discrepancy existing between inclusive and exclusive measurements of the ${}^8\mathrm{Li}+{}^4\mathrm{He}\to {}^{11}\mathrm{B}+n$ reaction cross section at $E_{cm}<3$ MeV is evaluated. This problem has profound astrophysical relevance for this reaction is of great interest in Big-Bang and r-process nucleosynthesis. By means of a novel technique, a comprehensive study of all existing ${}^8\mathrm{Li}+{}^4\mathrm{He}\to {}^{11}\mathrm{B}+n$ cross section data is carried out, setting up a consistent picture in which all the inclusive measurements provide the reliable value of the cross section. New unambiguous signatures of the strong branch pattern non-uniformities, near the threshold of higher ${}^{11}\mathrm{B}$ excited levels, are presented and their possible origin, in terms of the cluster structure of the involved excited states of ${}^{11}\mathrm{B}$ and ${}^{12}\mathrm{B}$ nuclei, is discussed.

5 pages, 4 figures, 1 table

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Cited by in corpus (1)

• Standard Big-Bang Nucleosynthesis up to CNO with an improved extended nuclear network