Physics – Nuclear Physics
Scientific paper
Apr 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011prpnp..66..298s&link_type=abstract
Progress in Particle and Nuclear Physics, Volume 66, Issue 2, p. 298-302.
Physics
Nuclear Physics
Scientific paper
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 2HLi 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 2HLi reaction using the break-up of 6Li at 150 A MeV. 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 S24-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.
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