The 18O(18O, 16O)20O reaction at 52 MeV

Abstract

Abstract The structure of the 20 O nucleus was studied by the 18 O( 18 O, 16 O) 20 O reaction at E 1ab = 52 MeV. Angular distributions for the transitions to the lowest four states in 20 O 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 20 O populated by the 18 O( 18 O, 16 O) 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 18 O( 18 O, 16 O) reaction. However, DWBA calculations for the 18 O(t, p) 20 O 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 ( 18 O, 16 O) reaction are very sensitive to the mixing of shell-model configurations. The angular distribution shapes are also slightly dependent on the mixing.