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A solution of the large discrepancy existing between inclusive and exclusivemeasurements of the ${}^8{\rm Li}+{}^4{\rm He}\to{}^{11}{\rm B}+n$ reactioncross section at $E_{cm} <3$ MeV is evaluated. This problem has profoundastrophysical relevance for this reaction is of great interest in Big-Bang andr-process nucleosynthesis. By means of a novel technique, a comprehensive studyof all existing ${}^8{\rm Li}+{}^4{\rm He}\to{}^{11}{\rm B}+n$ cross sectiondata is carried out, setting up a consistent picture in which all the inclusivemeasurements provide the reliable value of the cross section. New unambiguoussignatures of the strong branch pattern non-uniformities, near the threshold ofhigher ${}^{11}{\rm B}$ excited levels, are presented and their possibleorigin, in terms of the cluster structure of the involved excited states of${}^{11}{\rm B}$ and ${}^{12}{\rm B}$ nuclei, is discussed.

astrophysical journal/the astrophysical journal

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