Neutron transfer reactions on the ground state and isomeric state of a Sn 130 beam

The structure of nuclei around the neutron-rich nucleus Sn132 is of particular interest due to the vicinity of the Z=50 and N=82 shell closures and the r-process nucleosynthetic path. Four states in Sn131 with a strong single-particle-like component have previously been studied via the (d,p) reaction, with limited excitation energy resolution. The Sn130(Be9,Be8)Sn131 and Sn130(C13,C12)Sn131 single-neutron transfer reactions were performed in inverse kinematics at the Holifield Radioactive Ion Beam Facility using particle-γ coincidence spectroscopy. The uncertainties in the energies of the single-particle-like states have been reduced by more than an order of magnitude using the energies of γ rays. The previous tentative Jπ values have been confirmed. Decays from high-spin states in Sn131 have been observed following transfer on the isomeric component of the Sn130 beam. The improved energies and confirmed spin-parities of the p-wave states important to the r-process lead to direct-semidirect cross sections for neutron capture on the ground state of Sn130 at 30 keV that are in agreement with previous analyses. A similar assessment of the impact of neutron-transfer on the isomer would require significant nuclear structure and reaction theory input. There are few measurements of transfer reaction on isomers, and this is the first on an isomer in the Sn132 region.