Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 31: Poster Session III

A 31.20: Poster

Donnerstag, 9. März 2017, 17:00–19:00, P OG1

Nuclear excitation by electron capture in astrophysical plasmas — •Hyoyin Gan and Adriana Pálffy — Max-Planck-Institut für Kernphysik, Saupfecheckweg 1, 69117 Heidelberg, Germany

The elements in the Universe are formed in the process of nucleosynthesis in hot and dense plasmas which contain a tremendous numbers of photons and electrons. Under these conditions, nuclear excitation and decay processes may occur differently than under laboratory conditions, influencing the nucleosynthesis paths. We investigate the effect of photoexcitation [1] and nuclear excitation by electron capture [2] in the hot dense stellar plasma. In particular we address specific cases of nuclear isotopes which have a sensitive level scheme with respect to excitation mechanisms, for instance because of the presence of a long-lived isomeric state. Possible effects for the nucleosynthesis process are discussed.

[1] J. Gunst et al., Phys. Rev. Lett. 112, 082501 (2014).

[2] A. Pálffy, W. Scheid and Z. Harman, Phys. Rev. A 73, 012712 (2006).