Neutron capture cross section to 186Re isomeric state Original Research Article

An 187Os-187Re pair is known as a good cosmochronometer for the nucleosynthesis of the r-process. One of problems is a contamination of s-process to 187Re. A path through a 186Re isomer have been ignored because of no data of neutron capture cross section. In order to estimate the contamination, the absolute neutron captures cross section to the isomer and the production ratio between the ground state and isomer of 186Re were measured through an activation technique with a thermal neutron.