Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 53: Nuclear Astrophysics VII

HK 53.4: Talk

Thursday, March 13, 2025, 16:45–17:00, SR 0.03 Erw. Physik

Neutron capture cross section, (n,γ), of natural Krypton in the s-process — •Jan Butz — Goethe Universität, Frankfurt am Main, Germany

An important step in understanding the origin of life is to study stellar nucleosynthesis. The abundance of elements up to iron is produced almost exclusively through nuclear fusion, whereas most heavy elements are formed via neutron capture in the s- and r-processes. The s-process occurs inside the shell burning of massive stars, while the r-process, however, requires extreme conditions, like type II supernovae or neutron star mergers.

Krypton plays a vital role in the s-process due to the branching points of ⁸¹Kr and ⁸⁵Kr. These branching points are nuclei where the decay rate is in the order of the neutron capture rate, r_β≈ r_n. To gain insight into these points, it is crucial to study the (n,γ)-reaction and the behavior of these nuclei under stellar conditions. Using the activation method, the neutron capture cross section for natural krypton was determined at stellar temperatures for the corresponding s-process components.

Keywords: neutron capture cross section; s-process; Krypton; activation method