Calculation of interband level spacings in the constrained Hartree-Fock approach

The constrained Hartree-Fock (CHF) approach with angular momentum constraints <ĵ²> and <ĵ_Z> has been used to calculate the low-lying 8⁺, T = 0 energy levels in ²⁴Mg. The excitation spectrum obtained using the solutions of the CHF equations whose angular momentum distributions are strongly localised about J = 8 approximate the results of an exact diagonalisation quite well. The necessity of projection after variation is circumvented in this procedure.

Research Associate in the Theoretical Physics Division, National Research Institute for Mathematical Sciences, CSIR, PO Box 395, Pretoria 0001, Republic of South Africa.