Photodisintegration of Se; Implications for the s-process branching at Se

Makinaga, Ayano*; Utsunomiya, Hiroaki*; Goriely, S.*; Kaihori, Takeshi*; Goko, Shinji*; Akimune, Hidetoshi*; Yamagata, Tamio*; Toyokawa, Hiroyuki*; Matsumoto, Tetsuro*; Harano, Hideki*; Harada, Hideo   ; Kitatani, Fumito  ; Hara, Kaoru; Hohara, Shinya*; Lui, Y.-W.*

Photoneutron cross sections were measured for Se immediately above the neutron separation energy with quasimonochromatic -ray beams to experimentally constrain the E1 strength function for Se. Two sets of the strength function and the level density that equally meet the experimental constraint predict largely different neutron capture cross sections for Se. Based on the Maxwell-averaged cross sections of the latest compilation complemented with the predicted cross sections for Se, we calculated N values of the main s-process component using a phenomenological model and deduced empirical abundances of the weak s-process component.