Microscopic Calculation of Rearrangement Energies in O16

The second- and third-order rearrangement contributions to the single-particle energies in O16 are calculated microscopically using the Sprung-de Tourreil force. The s-state second-order rearrangement has been evaluated by an energy-averaging procedure proposed by Engelbrecht and Weidenmüller. The second order is as big as the third for p states and much bigger for the s state. Thus it should be included before comparison to experiment. The average rearrangement energy per particle is 10.5 MeV and the s-state spreading width 13 MeV.