Single-neutron excitations in neutron-rich Ge83 and Se85

The H-2(Ge-82,p)Ge-83 and H-2(Se-84,p)Se-85 reactions were studied with radioactive beams of Ge-82 and Se-84 at beam energies of E-beam=330 and 380 MeV, respectively. Excitation energies, proton angular distributions, and asymptotic normalization coefficients have been determined for the lowest lying states of Ge-83 and Se-85. Spectroscopic factors have also been extracted under normal assumptions of the bound-state potential properties in the distorted waves Born approximation analysis. However, the peripheral character of the measurements leads to large uncertainties in this extraction. Shell-model calculations have been performed in the region above Ni-78, comparing the single-particle properties of the even-Z,N=51 nuclei up to Zr-91 and including Ge-83 and Se-85. Direct-semidirect neutron capture calculations to Ge-83 and Se-85 have also been performed using the spectroscopic input from these (d,p) reaction measurements.