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27 April 2024

» arxiv » 1011.6179

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High-energy break-up of 6Li as a tool to study the Big-Bang nucleosynthesis reaction 2H(alpha,gamma)6Li
F.Hammache ; M.Heil ; S.Typel ; D.Galaviz ; K.Sümmerer ; A.Coc ; F.Uhlig ; F.Attallah ; M.Caamano ; D.Cortina ; H.Geissel ; M.Hellström ; N.Iwasa ; J.Kiener ; P.Koczon ; B.Kohlmeyer ; P.Mohr ; E.Schwab ; K.Schwarz ; F.Schümann ; P.Senger ; O.Sorlin ; V.Tatischeff ; J.P.Thibaud ; E.Vangioni ; A.Wagner ; W.Walus ;
Date:	29 Nov 2010
Abstract:	The recently claimed observations of non-negligible amounts of 6Li in old halo stars have renewed interest in the Big-Bang Nucleosynthesis (BBN) of 6Li. One important ingredient in the predicted BBN abundance of 6Li is the low-energy 2H(alpha,gamma)6Li cross section. Up to now, the only available experimental result for this cross section showed an almost constant astrophysical S-factor below 400 keV, contrary to theoretical expectations. We report on a new measurement of the 2H(alpha,gamma)6Li reaction using the break-up of 6Li at 150 A MeV. Even though we cannot separate experimentally the Coulomb contribution from the nuclear one, we find clear evidence for Coulomb-nuclear interference by analyzing the scattering-angular distributions. This is in-line with our theoretical description which indicates a drop of the S_24-factor at low energies as predicted also by most other models. Consequently, we find even lower upper limits for the calculated primordial 6Li abundance than before.
Source:	arXiv, 1011.6179
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