Number-projected three-quasiparticle description of the odd Sn isotopes

Abstract

An account is given of the description of the low-energy properties of the odd Sn nuclei in terms of number projected one- (1 q.p.) and three-quasiparticle (3 q.p.) states. The shell model space for the neutrons consists of one major shell. A simple Gaussian force is used as an effective interaction. Its strength and the single-particle energies, which are the only parameters, are derived in a consistent way from spectroscopic data on the one-quasiparticle states.