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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Nuclear Astrophysics II

HK 11.2: Vortrag

Montag, 14. März 2016, 17:00–17:15, S1/01 A02

Investigation of the s-process branch-point nucleus ⁸⁶Rb at HIγS* — •Philipp Erbacher¹, Jan Glorius¹, Johann Isaak², Bastian Loeher², Rene Reifarth¹, Deniz Savran², Kerstin Sonnabend¹, and Werner Tornow³ — ¹Goethe Universität Frankfurt am Main, Germany — ²GSI Helmholzzentrum für Schwerionenforschung, Germany — ³Duke University, USA

The branch-point nucleus ⁸⁶Rb determines the isotopic abundance ratio ⁸⁶Sr/⁸⁷Sr in s-process nucleosynthesis. Thus, stellar parameters such as temperature and neutron density and their evolution in time as simulated by modern s-process network calculations can be constrained by a comparison of the calculated isotopic ratio with the one observed in SiC meteoritic grains. To this end, the radiative neutron-capture cross section of the unstable isotope ⁸⁶Rb has to be known with sufficient accuracy.
Since the short half-life of ⁸⁶Rb prohibits the direct measurement, the nuclear-physics input to a calculation of the cross section has to be measured. For this reason, the γ-ray strength function of ⁸⁷Rb was measured using the γ³ setup at the High Intensity γ-ray Source facility at TUNL in Durham, USA. First experimental results will be presented.
*supported by the DFG (SO907/2-1), HGS-HIRe, and HIC for FAIR