Neutron Single-Particle States in r-Process Nuclei Near Closed Shells

We have begun a program to measure (d,p) reactions on neutron-rich nuclei, probing the single-particle states near the N = 50 and N = 82 closed shells. We have measured the neutron transfer on two N = 50 isotones, 82 Ge and 84 Se, at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. We have also performed a test measurement of transfer on 124 Sn to develop the techniques to study the 2 H( 130,132 Sn,p) 131,133 Sn reactions. Preliminary results for 85 Se are consistent with 5/2 + ground state and 1/2 + first excited state assignments, and the successful measurement of the 2 H( 124 Sn,p) 125 Sn reaction demonstrates the feasibility to measure the (d,p) reaction with neutron-rich 130,132 Sn beams.