Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 18: Nukleare Astrophysik I
HK 18.2: Vortrag
Dienstag, 22. März 2011, 14:30–14:45, HS3
Study of the 2H(α,γ)6Li reaction at LUNA — •Michael Anders and Daniel Bemmerer — Forschungszentrum Dresden-Rossendorf (FZD), Dresden, Germany
Observations of very metal poor stars have yielded evidence for the less abundant lithium isotope 6Li in several cases. These findings prompt the question whether there is a non-negligible primordial contribution to the observed 6Li abundances. Network calculations show that the 2H(α,γ)6Li reaction dominates 6Li production in the Big Bang. A recent Coulomb dissociation work on this reaction produced only an upper limit for the astrophysical S-factor. At the 400 kV underground accelerator LUNA in Gran Sasso/Italy, an experiment is underway to gain direct cross section data, but the background is formidable. Preliminary data of the first phase of the LUNA experiment will be shown, and an outlook will be given. – Supported by INFN and by DFG (BE 4100/2-1).