SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Nuclear Astrophysics III

HK 30.3: Vortrag

Mittwoch, 22. März 2023, 14:45–15:00, SCH/A419

Results of total and partial cross-section measurements of the ⁸⁷Rb(p,γ)⁸⁸Sr reaction — •Svenja Wilden, Felix Heim, Martin Müller, Pina Wüstenberg, and Andreas Zilges — University of Cologne, Institute for Nuclear Physics

The existence of most of the proton rich stable nuclei - the p nuclei - cannot be explained via neutron-capture reactions. Therefore, at least one other process has to exist in order to describe their origin, the γ process. Since most photodisintegration reactions involved in the process are not directly accessible, reliable statistical model calculations are needed to predict cross sections and reaction rates. The cross sections include total cross sections describing the probability of the reaction itself and partial cross sections describing the decay to certain discrete states in the final nucleus. To improve the calculations the nuclear input parameters need to be constrained. This requires a large experimental database. Via comparison of experimental data to theoretical predictions different models can be excluded or constrained. In order to study the ⁸⁷Rb(p,γ)⁸⁸Sr reaction an in-beam experiment at the high-efficiency HPGe γ-ray spectrometer HORUS at the University of Cologne was performed. Proton beams with energies between E_p = 2.0 − 5.0 MeV were provided by the 10 MV FN Tandem accelerator. Final results on absolute cross sections and first results on partial cross sections will be presented as well as comparisons to theoretical model calculations.

Supported by the DFG (ZI 510/8-2).