Abstract
Quantum-number projection is applied to generate exact eigenstates of angular momentum or of particle numbers from the self-consistent solution of the angular-momentum- and particle-number-constrained Hartree-Fock-Bogoliubov (CHFB) equation. Calculations are based on the symmetry-conserving microscopic Hamiltonian and the large single-particle space spanned by spherical Nilsson bases covering about 1.5 major shells for both protons and neutrons in the case of the yrast bands for and almost three major shells in the case of the superdeformed bands as well as g and s bands for The residual interaction is given by the monopole- and quadrupole-pairing interactions plus the quadrupole-quadrupole interaction. Symmetry properties of the Hamiltonian are fully taken into account through both stages of solving the CHFB equation and projections to reduce computational time substantially. A great mixture of angular momentum components requires the projection while particle-number projections become less important at high spins, especially along superdeformed bands with vanishingly small static gaps. It is shown that the angular momentum projection is effective to reproduce superdeformed levels appearing in the yrast band together with the g and s bands.
- Received 1 May 1998
DOI:https://doi.org/10.1103/PhysRevC.59.135
©1999 American Physical Society