Photodisintegration of ⁸⁰Se: Implications for the s-process branching at ⁷⁹Se

Photoneutron cross sections were measured for ⁸⁰Se immediately above the neutron separation energy with quasimonochromatic γ-ray beams to experimentally constrain the E1 γ strength function for ⁸⁰Se. Two sets of the γ strength function and the level density that equally meet the experimental constraint predict largely different neutron capture cross sections for ⁷⁹Se. Based on the Maxwellian-averaged cross sections of the latest compilation complemented with the predicted cross sections for ⁷⁹Se, we calculated σN values of the main s-process component using a phenomenological model and deduced empirical abundances of the weak s-process component. An attempt is made of considering the implications of the abundance ratios of ⁸⁰Kr and ⁸²Kr within the framework of phenomenological models for the weak s process.