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HK: Fachverband Hadronen und Kerne

HK 38: Nuclear Astrophysics

HK 38.1: Invited Group Report

Tuesday, March 17, 2009, 16:30–17:00, H-ZO 60

Photon-induced experiments for nuclear astrophysics^* — •Kerstin Sonnabend — Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany

Photon-induced experiments play an important role in the solution of the puzzle about the production of the heavy elements in different nucleosynthesis scenarios. The most direct impact can be seen in the production of the so-called p nuclei by photodisintegration reactions like (γ,n), (γ,p), and (γ,α). Complete network calculations include several hundred mainly unstable isotopes with the corresponding reactions rates and, therefore, rely on theoretical predictions of these rates normally performed in the framework of Hauser-Feshbach theory. Thus, the reliability of these calculations should be tested experimentally for selected isotopes [1].

In addition, the knowledge of the photo-response of an isotope below the particle-emission thresholds yields worthwhile information on the according photon-strength function which is besides the level density and the particle-optical potentials the main input for predictions in the Hauser-Feshbach model. Photon-scattering and photon-absorption experiments are ideal tools to study the most important contributions of the dipole strength functions [2].

Recent studies on astrophysically relevant isotopes below and above the neutron separation threshold will be presented. 0pt

^*supported by DFG (SFB 634)

[1] J. Hasper et al., Phys. Rev. C 77 (2008) 015803.

[2] U. Kneissl et al., J. Phys. G 32 (2006) R217.