Production of Re by proton bombardment of enriched W

Iimura, Hideki  ; Horiguchi, Takayoshi*; Ishida, Yoshihisa*; Ito, Mitsuo; Koizumi, Mitsuo ; Miyabe, Masabumi   ; Oba, Masaki 

The nucleus Re is of interest from the astrophysical point of view, since production of this nucleus in stars could change an accuracy of nucleo-cosmochronometer. In order to calculate the neutron capture cross section theoretically, it is necessary to know the spin of nucleus. However, the spin of Re has not been established so far. In order to clarify the nuclear structure of this nucleus, we plan laser spectroscopy of Re, and first, we measured the production yield of the () reaction. The experiment was carried out by irradiating a W target with a proton beam from the JAEA tandem accelerator. Rhenium was chemically separated from the irradiated sample, and then -ray measurements were performed. As a result, we determined the production yield of the W()Re reaction for the first time and suggested the same spin for Re as the known spin of =8 for Re.