COVARIANT DESCRIPTION OF THE LOW-LYING STATES IN NEUTRON-DEFICIENT Kr ISOTOPES

Starting from a covariant density functional of point-coupling, the spectroscopic properties of low-lying states in ^72,74,76,78Kr, including potential energy curves, energy spectrum and electric quadrupole transition strengths, are calculated by mixing of angular momentum projected axially deformed relativistic mean-field+BCS states. The calculated results are compared with the corresponding data. The phenomena of shape coexistence in these nuclei is discussed.