High-spin states in 170Ta have been studied via 159Tb(16O, 5nγ)170Ta reaction through excitation functions, K x-γ, and γ-γ-t coincidence measurements. Three rotational bands have been identified which consist of two strongly coupled bands and a semidecoupled one. The quasiparticle configurations of these bands and the interpretation of experimental results are discussed based on the existing knowledge of neighboring odd-mass and odd-odd nuclei and in the framework of the cranked-shell model. Low-spin signature inversion in the π9/2-[514]⊗ν5/2+[642] and π1/2-[541]⊗ν5/2+[642] bands are discussed. A delay reduction of the band-crossing frequency is observed in the π1/2-[541]⊗ν5/2+[642] (π5/2+[402]⊗ν5/2-[642]) band. This configuration-dependent crossing frequency is discussed in comparison with the AB crossing frequencies in the related bands of neighboring odd-Z isotopes.

High-spin states in 190Tl have been studied experimentally by using the 160Gd(35Cl,5n) fusion-evaporation reaction at beam energies of 167 and 175 MeV. A rotational band built on the πh9/2⊗νi13/2 configuration with oblate deformation has been established for 190Tl. Spin values are assigned by adopting the results from α-γ decay work for 194Bi found in the literature.With the configuration and spin-parity assignments, the low-spin signature inversion has been revealed for the πh9/2⊗νi13/2 oblate band in 190Tl. It is the first experimental observation of low-spin signature inversion for a band associated with the oblate πh9/2⊗νi13/2 configuration. The low-spin signature inversion for the oblate πh9/2⊗νi13/2 band can be interpreted by the two-quasiparticle-plus-rotor model including a J-dependent p-n residual interaction.

An effort has been made to search for the decoupled bands in odd-odd 174Re via the 159Tb(20Ne, 5nγ)174Re reaction through excitation functions, K x-γ and γ-γ coincidence measurements. The doubly decoupled band and the semidecoupled one have been found in this work. Their quasiparticle conØgurations are proposed to be π1=2-[541]⊗ν1=2-[521] and π1=2-[541]⊗νi13=2, respectively, according to the characteristics of band structures in this mass region. Another band with strongly coupled character is also reported.

High-spin states in the odd-odd 172Re have been investigated via the 149Sm(27Al, 4nγ)172Re reaction through excitation functions, x-γ and γ-γ coincidence measurements. A level scheme consisting of three rotational bands has been identified for the first time extending the high-spin studies of A～160 odd-odd nuclei to the currently lightest rhenium isotope. The three bands have been assigned to be built on the πh11/2⊗νi13/2, πh9/2⊗νi13/2, and p1/2−[541]⊗ν1/2−[521] configurations according to their rotational properties in quasiparticle alignments, signature splitting, in-band B(M1)/B(E2) ratios, level spacing systematics, band crossing frequencies, as well as the existing knowledge in neighboring nuclei. Low-spin signature inversion has been confirmed in the first two bands due to the observation of signature crossing at high-spin states. The general features of inversion phenomenon in the semidecoupled bands are presented and discussed with reference to theoretical calculations of two quasiparticle plus rotor model including p-n interactions.

Excited states of 142Ce, populated in deep inelastic reactions of 82Se projectiles bombarding 139La target, have been studied up to medium spins using in-beam γ spectroscopy techniques. Three new levels have been identified at 2625, 2995, 3834 keV, and assigned as 8+, 9(−) and 11(−), respectively. These new yrast states follow closely the level systematics of the even mass N=84 isotones. Their strctures have been discussed with the help of empirical shell model calculations.