Neutron single-particle states in r-process nuclei near closed shells

J. S. Thomas, Rutgers University–New Brunswick
D. W. Bardayan, ORNL Physics Division
J. C. Blackmon, ORNL Physics Division
J. A. Cizewski, Rutgers University–New Brunswick
R. P. Fitzgerald, The University of North Carolina at Chapel Hill
U. Greife, Colorado School of Mines
C. J. Gross, ORNL Physics Division
M. S. Johnson, Rutgers University–New Brunswick
K. L. Jones, Rutgers University–New Brunswick
R. L. Kozub, Tennessee Technological University
J. F. Liang, ORNL Physics Division
R. J. Livesay, Colorado School of Mines
Z. Ma, The University of Tennessee, Knoxville
B. H. Moazen, Tennessee Technological University
C. D. Nesaraja, Tennessee Technological University
D. Shapira, ORNL Physics Division
M. S. Smith, ORNL Physics Division
D. W. Visser, The University of North Carolina at Chapel Hill


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, 82Ge and 84Se, at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. We have also performed a test measurement of transfer on 124Sn to develop the techniques to study the 2H(130,132Sn, p)131,133Sn reactions. Preliminary results for 85Se are consistent with 5/2+ ground state and 1/2+ first excited state assignments, and the successful measurement of the 2H(124Sn,p)125Sn reaction demonstrates the feasibility to measure the (d,p) reaction with neutron-rich 130,132Sn beams. © 2005 Elsevier B.V. All rights reserved.