Shape evolution in 76,78Kr nuclei at high spins in tilted axis cranking Hartreea€“Focka€“Bogoliubov approach

摘要

A two-dimensional tilted axis cranking Hartreea€“Focka€“Bogoliubov (CHFB) calculation is performed for 76Kr and 78Kr nuclei up to high spins e??? = 30 employing a pairing-plus-quadrupole (PPQ) model interaction Hamiltonian. Intricate details of the evolution of single particle structures and shapes as a function of spin have been investigated. The results show the existence of energy levels with high e??? quantum numbers lying close to the yrast line in both the nuclei. Such high e??? states should exhibit isomeric characteristics due to the e???-selection rules for the e???-decays. Moreover, in 78Kr a new band with e??? = 20a€“30 lying below the observed ground band is predicted.