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

Photoneutron cross sections were measured for {sup 80}Se immediately above the neutron separation energy with quasimonochromatic {gamma}-ray beams to experimentally constrain the E1 {gamma} strength function for {sup 80}Se. Two sets of the {gamma} strength function and the level density that equally meet the experimental constraint predict largely different neutron capture cross sections for {sup 79}Se. Based on the Maxwellian-averaged cross sections of the latest compilation complemented with the predicted cross sections for {sup 79}Se, we calculated {sigma}N 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 {sup 80}Kr and {sup 82}Kr within the framework of phenomenological models for the weak s process.