Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 42: Nuclear Astrophysics III

HK 42.5: Talk

Thursday, March 30, 2017, 15:15–15:30, F 33

Implementation of isomeric states into stellar nucleosynthesis codes — •Deniz Kurtulgil, Kathrin Göbel, René Reifarth, and Benedikt Thomas — Goethe University Frankfurt

The existence of indirect transitions between ground and long-lived isomeric states through thermal excitation into higher lying states was implemented into a stellar nucleosynthesis code.

Gaining information about the inner workings of stellar burning and thermonuclear explosion phases through direct observation is difficult. Therefore, nuclear astrophysics has to rely on stellar modelling and nucleosynthesis codes to produce those results, which can then be compared to the observable data, like elemental abundances from astronomical spectroscopy or isotopic ratios in presolar grains. One process of interest is the effect that high temperatures have on the lifetime of long-lived isomeric states (e.g. ²⁶Al, ⁸⁵Kr), where thermal excitations and subsequent decay processes into different states can significantly alter the abundance distribution and availability for further nucleosynthesis reactions of the isotope.

This talk will outline the implementation of isomeric states, first tests on well-studied cases like ²⁶Al and its application to the s-process branchpoint ⁸⁵Kr.