Neutron single particle structure in 131Sn and the r-process

R. L. Kozub, Tennessee Technological University
A. S. Adekola, Ohio University
D. W. Bardayan, ORNL Physics Division
J. C. Blackmon, ORNL Physics Division
K. Y. Chae, The University of Tennessee, Knoxville
K. A. Chipps, Colorado School of Mines
J. A. Cizewski, Rutgers University–New Brunswick
L. Erikson, Colorado School of Mines
R. Hatarik, Rutgers University–New Brunswick
K. L. Jones, The University of Tennessee, Knoxville
W. Krolas, Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
F. Liang, ORNL Physics Division
Z. Ma, The University of Tennessee, Knoxville
C. Matei, Oak Ridge Assoct. Universities
B. H. Moazen, The University of Tennessee, Knoxville
C. D. Nesaraja, ORNL Physics Division
S. D. Pain, ORNL Physics Division
D. Shapira, ORNL Physics Division
J. F. Shriner, Tennessee Technological University
M. S. Smith, ORNL Physics Division
T. P. Swan, Rutgers University–New Brunswick


Recent calculations suggest that, at late times in the r-process, the rate of neutron capture by 130Sn has a significant impact on nucleosynthesis. Direct capture into low-lying bound states is likely the dominant reaction in the r-process near the N=82 closed shell, so reaction rates are strongly impacted by the properties of neutron single particle states in this region. In order to investigate these properties, we have acquired (d,p) reaction data in the A∼132 region in inverse kinematics using ∼630 MeV beams (4.85 MeV/u for 130Sn) and CD2 targets. An array of Si strip detectors, including SIDAR and an early implementation of the new Oak Ridge Rutgers University Barrel Array (ORRUBA), was used to detect reaction products. Preliminary results for the 130Sn(d,p)131Sn experiment are reported. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlikeLicence.