Abstract
Abstract Nuclei in the mass-180 region have many high-Ω single-particle levels close to the Fermi energy and are, therefore, prime candidates for high- K isomers. Since both neutron and proton level densities are rather low, one should expect blocking and particle-number fluctuations to be rather important. We have performed good-particle-number calculations and have shown that the simpler blocked BCS theory gives a good approximation to the multi-quasiparticle spectra if the pairing strength is chosen appropriately. This has allowed us to perform a systematic theoretical study of this mass region. Residual spin-spin interactions are shown to be essential in reproducing the energies and even the correct order of known states. Good agreement has been found for 175 Hf, 176 Hf and 177 Ta, where extensive data already exist. Predictions for new high- K states near the yrast line are made for these nuclei and for 178 W.
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