Abstract

Photoneutron cross sections were measured for 80Se near the neutron separation energy with laser Compton‐backscattered γ‐ray beams at AIST. Neutron capture rates are evaluated for 79Se with the photoreaction data as experimental constraints on the El γ‐strength function, a key parameter in the Hauser‐Feshbach statistical model calculation. Solving the set of differential equations under a single neutron exposure, we analyzed the solar abundance ratio of the weak components of 80Kr and 82Kr in terms of the s‐process branching at 79Se. We discuss the region of temperature and neutron density allowed for the weak s‐process nucleosynthesis.

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