Structure of various K bands in 178Hf

Many bands of states are now known experimentally in the nucleus 178Hf. These bands seem to have K as a good quantum number and some of the band-heads are isomers. The structure of this nucleus has been studied by doing Hartree-Fock calculation using a ''modified surface delta interaction'' with one active ma or shell for each of protons and neutrons and with 132Sn as the core. There is axial symmetry in the calculation, but no time-reversal symmetry for the K/O bands. Solutions obtained are K = 0+, 8- and 24- with prolate deformation and a K = 0+ intrinsic state with oblate deformation. Considering the prolate Hartree-Fock solutions and particle-hole excitations across their Fermi surfaces, it has been possible to obtain the bands seen experimentally. The isomerism of the bands can be explained by the microscopic calculation. Two K = 16+ bands, one band with two unpaired protons and two unpaired neutrons, and the other with four unpaired neutrons are obtained. (auth.)