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The 18O(18O, 16O)20O reaction at 52 MeV
Authors:S. Kubono  T.K. Li  D. Dehnhard  D.A. Lewis  J.F. Petersen  J.L. Artz
Affiliation:1. Brookhaven National Laboratory, Upton, NY 11973, USA;2. School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
Abstract:The structure of the 20O nucleus was studied by the 18O(18O, 16O)20O reaction at E1ab = 52 MeV. Angular distributions for the transitions to the lowest four states in 20O were obtained and analyzed with finite-range DWBA calculations. Optical potential sets were used which fit the experimental elastic scattering differential cross sections over almost the whole angular range. The two L = 0 transitions to the ground state and the 4.45 MeV state of 20O populated by the 18O(18O, 16O) reaction were analyzed with exact finite-range DWBA calculations using microscopic form factors. These calculations underestimate the absolute cross sections by a factor of 11. The relative strength of the two L = 0 transitions is well reproduced in the 18O(18O, 16O) reaction. However, DWBA calculations for the 18O(t, p)20O reaction overestimated the relative cross sections for the excited 0+ state by a factor of 6. Several model wave functions were tested for the ground-state transition. It was found that the absolute cross sections of the (18O, 16O) reaction are very sensitive to the mixing of shell-model configurations. The angular distribution shapes are also slightly dependent on the mixing.
Keywords:Nuclear reactions
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