Collective states in 48V

Abstract

The low-lying positive parity states of 48V have been studied in the framework of deformed configuration mixing model calculations based on projected Hartree-Fock theory, within the full fp shell space. The modified Kuo-Brown effective interaction has been used. The calculated spectrum and the electromagnetic properties of these states are in good agreement with the experiment. The calculation predicts an excited low-lying collective K = 2 + band in the spectrum of 48V and accounts for the observed breakdown of the “signature” selection rule arising in the shell-model calculation within the ( f 7 2 ) nd space. It does not favour a 5 + assignment to the observed 1.099 MeV level. Two sets of proton and neutron effective charges (i) e p = 1.32 e and e n = 0.89 e and (ii) Kuo and Osnes charges e p = 1.25 e and e n = 0.47 e were employed. The observed decay properties appear to favour the latter charges. Our model also explains in a semiquantitative way the observed K-value, moment of inertia parameter and the intrinsic quadrupole moment of the K = 1 −1 rotational band.