Fermion-boson coupling model (QCVM) applied to odd Zn isotopes

Abstract

Low lying energy levels and transition probabilities of 63, 65, 6VZn are calculated in the Quasicluster-vibration model (QCVM). This model is an extension of the Clustervibration model (CVM) for three-particle-cluster vibration coupling. Instead of a threeparticle cluster, now a one broken pair (number projected three quasiparticle) cluster is coupled to phonon states. It turns out that the sequence of isotopes may be described with one set of parameters, along the same line as previously used in the CVM. The resulting spectra and electromagnetic properties, for positive and negative parity states of odd Zn isotopes, compare with experimental data equally well as large shell-model calculations; this seems to justify the extension of the CVM to these nuclei with more than three particles or holes beyond a closed shell.

Spectroscopy of neutron deficient 65Ge

“…The parameters obtained are For thep 3/2 ,f 5/2 ,p 1/2 andg 9/2 states, quasi-particle energies = 0, 0.05, 1.25 and 2.18 MeV with respect top 3/2 , and occupation probabilities = 0.64, 0.31, 0.06 and 0.03, respectively, were obtained from BCS calculations using singleparticle energies from Ref. [5] and G = 0.32 MeV. These val- [6], while the value for Λ 0 is decreased in order to lower the position of the calculated 9/2 − 1 state, in agreement with the systematics of Λ 0 for Ge isotopes.…”