Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 58: Nuclear Astrophysics II

HK 58.1: Gruppenbericht

Freitag, 3. April 2020, 11:00–11:30, J-HS B

Experimental techniques for Nuclear Astrophysics in Cologne — •Felix Heim, Jan Mayer, Marco Menen, Martin Müller, Philipp Scholz, and Andreas Zilges — Institute for Nuclear Physics, University of Cologne

The universe was born with just hydrogen, helium, and small traces of lithium. The question of how the remaining elements were created by nuclear reactions in stars, stellar explosions, and stellar collisions is one of the main problems addressed by the interdisciplinary field of nuclear astrophysics. Most of the heavy nuclei beyond the iron-peak region are synthesized within complex nucleosynthesis networks which include thousands of nuclear reactions on stable and unstable nuclei. At present, most of the reactions rates involved are taken from theory in the framework of the Hauser-Feshbach model. Therefore, it is essential to extend the available experimental database on the one hand and to constrain the nuclear physics parameters entering the theoretical calculations on the other hand. Radiative proton-capture reactions are well-suited for this purpose, as the emitted prompt γ-rays yield important information about the statistical γ-decay behavior in the compound nucleus. α-induced reactions can be used to constrain the α-optical model potential. In this contribution, details of the experimental techniques will be presented as well as recent experimental results for the ¹⁰⁷Ag(p,γ)¹⁰⁸Cd, ^63,65Cu(p,γ)^64,66Zn, and ¹⁴⁴Sm(α,γ)¹⁴⁸Gd reactions.

Supported by the DFG (ZI 510/8-1).