Abstrakt
Neutron capture experiments on highly enriched Sn-117,Sn- 119 isotopes were performed with the DANCE detector array located at the Los Alamos Neutron Science Center. The DANCE detector provides detailed information about the multi-step gamma-ray cascade following neutron capture.
Analysis of the experimental data provides important information to improve understanding of the neutron capture reaction, including a test of the statistical model, the assignment of spins and parities of neutron resonances, and information concerning the Photon Strength Function (PSF) and Level Density (LD) below the neutron separation energy. Preliminary results for the (n,gamma) reaction on Sn-117,Sn- 119 are presented.
Resonance spins of the odd-A tin isotopes were almost completely unknown. Resonance spins and parities have been assigned via analysis of the multi-step gamma-ray spectra and directional correlations.