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Thermal neutron capture cross-section to {sup 113}Cd isomer for the study of s-process origin of {sup 115}Sn

The astrophysical origin of a p‐nucleus 115Sn has remained still an open question. The nucleus 115Sn may be produced by a weak branch of the s‐process through a β‐unstable isomer in 113Cd. However, a neutron capture cross‐section to this isomer has not been measured with high accuracy at any energy. A neutron capture cross‐section for the 112Cd(n,γ)113Cdm reaction has been measured with neutrons provided from a nuclear reactor. The nucleus 115Sn may be produced by a nucleosynthesis flow through 113Cdm in the s‐process. We have obtained the thermal neutron capture cross‐section of 0.028±0.009 [b] and the resonance integral of 1.1±0.3 [b] using a cadmium difference method. The cross‐section ratio of the isomer to the ground state has been calculated as a function of the incident neutron energy, E, by using a statistical model. The calculated ratios are almost constant over a wide range of E<100 keV. We have evaluated the s‐process contribution to the solar abundance of 115Sn using the classical steady‐flow ...