München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 38: Nuclear Astrophysics III

HK 38.4: Vortrag

Mittwoch, 20. März 2019, 15:00–15:15, HS 18

Investigating total and partial cross sections of the ¹⁰⁷Ag(p,γ)¹⁰⁸Cd reaction — •F. Heim, M. Körschgen, J. Mayer, M. Müller, P. Scholz, and A. Zilges — University of Cologne, Institute for Nuclear Physics

For many nucleosynthesis processes in various astrophysical scenarios cross sections and reaction rates need to be predicted by statistical model calculations. One of those processes is the γ process, which plays an important role in the nucleosynthesis of the majority of the p nuclei. The calulated values depend heavily on nuclear physics input-parameters like nuclear level densities (NLD), γ-ray strength functions (γ-ray SF) and nucleon+nucleus optical model potentials (OMPs). Precise cross-section measurements at astrophysical energies can be used to test and validate microscopic theoretical approaches for these nuclear physics models. For this reason, total and partial cross-sections of the ¹⁰⁷Ag(p,γ)¹⁰⁸Cd reaction were measured via the in-beam method at the high-efficiency HPGe γ-ray spectrometer HORUS at the University of Cologne. Proton beams with energies between 2.0 and 5.0 MeV were provided by the 10 MV FN-Tandem accelerator. Microscopic models for the NLD and γ-ray SF have been adjusted in a way, that they do not only agree with the total and partial cross-section results but also preserve physical reliability.
Supported by the DFG (ZI 510/8-1) and the "ULDETIS" project within the UoC Excellence Initiative institutional strategy.