A solution of the large discrepancy existing between inclusive and exclusive measurements of the Li-8 + He-4 -> B-11 + 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 Li-8 + He-4 -> B-11 + 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 B-11 excited levels, are presented and their possible origin, in terms of the cluster structure of the involved excited states of B-11 and (12)Bnuclei, is discussed.
|Titolo:||Solving the large discrepancy between inclusive and exclusive measurements of the 8Li+4He --> 11B + n reaction cross section at astrophysical energies|
|Data di pubblicazione:||2009|
|Citazione:||Solving the large discrepancy between inclusive and exclusive measurements of the 8Li+4He --> 11B + n reaction cross section at astrophysical energies / La Cognata M.; Del Zoppo A.; Alba R.; Cherubini S.; Colonna N.; Di Pietro A.; Figuera P.; Gulino M.; Lamia L.; Musumarra A; Pellegriti M. G.; Pizzone R. G.; Rolfs C.; Romano S.; Spitaleri C.; Tumino A.. - In: THE ASTROPHYSICAL JOURNAL LETTERS. - ISSN 2041-8205. - 706:2(2009), pp. L251-L255.|
|Appare nelle tipologie:||1.1 Articolo in rivista|