Photodisintegration of 80Se and its implications for s-process branching

Photodisintegration cross sections were measured for 80Se with laser Compton scattering γ beams at Eγ=9.98–11.80 MeV near the neutron separation energy. The stellar neutron capture rate for 80Se was evaluated by using the photodisintegration data as constraints on the E1 γ strength function for 80Se within the framework of the Hauser‐Feshbach statistical model. It was found that the rate at 30 keV is 0.7–1.1 times that of Bao and Kappeler. s‐process temperatures deduced from the empirical solar abundances of the s‐only nuclei 79Se and 80Kr with this neutron capture rate are 17–25 keV in the neutron density rage of (0.8–1.9)×103/cm3.