Stellar (n,γ) cross sections for Br and Rb: Matching the weak and main s-process components

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Radiative Capture, Hydrostatic Stellar Nucleosynthesis, 39<=A<=58, 59<=A<=89

Scientific paper

The stellar (n,γ) cross sections of Br79, Br81, Rb85, and Rb87 have been determined by a series of ten activation measurements in a quasistellar neutron spectrum corresponding to a thermal energy of kT=25 keV. The final uncertainties between 3 and 10% were dominated by the γ-ray intensities in the decay of the respective reaction products. All other uncertainties were significantly reduced through variation of the experimental parameters. The consequences of these results for s-process nucleosynthesis of Br and Rb, and in particular of the local s-only isotopes Kr80,82 and Sr86,87, are discussed with respect to the branching points at Se79 and Kr85. The contributions of both the main s component from thermally pulsing low mass asymptotic giant branch stars and the weak s component from massive stars are considered in this analysis.

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