Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Nukleare Astrophysik I

HK 18.1: Group Report

Tuesday, March 22, 2011, 14:00–14:30, HS3

Microscopic calculation of the ³He(α,γ)⁷Be reaction rate using realistic interactions — •Thomas Neff, Hans Feldmeier, and Karlheinz Langanke — GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt

We calculate the radiative capture cross sections for the ³He(α,γ)⁷Be and the ³H(α,γ)⁷Li reactions in the fully microscopic Fermionic Molecular Dynamics approach using a realistic effective interaction obtained in the Unitary Correlation Operator Method. At large distances bound and scattering states are described by antisymmetrized products of ⁴He and ³He/³H ground states. At short distances the many-body Hilbert space is extended with additional many-body wave functions obtained by variation after parity and angular momentum projection. These additional configurations are needed to represent polarized clusters and shell-model like configurations. Properties of the bound states like binding energies, charge radii and quadrupole moments are described well, as are the scattering phase shifts. The calculated S-factor for the ³He(α,γ)⁷Be reaction agrees very well with recent experimental data both in absolute normalization and energy dependence. In case of the ³H(α,γ)⁷Li reaction the calculated S-factor is larger than the experimental data by about 15%.