An in-beam γ-ray spectroscopy experiment for 142Pm has been performed via the 128Te (19F, 5n) reaction at beam energies of 75 MeV through 95 MeV. Excitation functions and γ-γ coincidences have been measured. Detailed analysis of γ-γ coincidence relationships leads to a revised high-spin level scheme for 142Pm. The πh11/2 vh11/2−1 multiplet in this nucleus has been identified and the discussion is based on a systematic of corresponding states in neighboring odd-odd nuclei. The previously known 67-μs isomer and associated decay grays have been placed into the new level scheme. This long-lived isomer is proposed to be a four-hole state with predominantly the （πg7/2−2-1d5/2-2vh11/2-1) 13-configuration.

High-spin states in 180Ir have been investigated by means of in-beam g-ray spectroscopy techniques with the 154Sm (31P,5nγ)180Ir reaction. Excitation functions, x-γ and γ-γ-t coincidences, DCO (directional correlation of grays deexciting oriented states) ratios, and intraband B(M1)/B(E2) ratios were measured. Five rotational bands have been identified and their configurations are proposed on the basis of B(M1)/B(E2) ratios and by comparing the band properties with known bands in neighboring odd-mass and even-mass nuclei. The neutron AB crossing is observed at hωc=0.26(1) MeV for the π1/2-[541]⊗v1/2-[521] and π1/2-[541]⊗v5/2-[512] bands, respectively. Staggering of levels as a function of the number of neutron pairs is revealed in the π1/2-[541]⊗v1/2-[521] doubly decoupled bands of 178-186Ir. The gradual alignment gains at low rotational frequencies are observed in the two strongly coupled bands. Band crossings and alignments in 180Ir are discussed with reference to the total Routhian surface and cranked shell model calculations performed for the neighboring odd-mass nuclei.

Abstract. High-spin states in 143Pm have been investigatedvia the 128Te(19F,4nγ)143Pm reaction using techniques of in-beam γ-spectroscopy. γ-ray singles, γ-γ coincidences, γ-ray anisotropies andDCO ratios have been measured. Based on these measurements, the level scheme of 143Pm has been extended up to an excitation energy of 10535.4 keV, including 48 new γ-rays deexciting 28 new levels. The yrast levels in 143Pm can be understood qualitatively in the framework of a weak-coupling model.

The low- and medium-spin states of the N=50 neutron-rich, 37 87Rb, 35 85Br, 34 84Se and 32 82Ge isotones have been populated in deep-inelastic processes produced by the interaction of 460 MeV 82Se ions with a 192Os target. The subsequent g decay has been investigated at the Laboratori Nazionali di Legnaro using the GASP g-ray detector array. The comparison of the experimentally observed excited states with shell-model calculations performed with and without neutron degrees of freedom has allowed the investigation of the role of the neutron-core breaking excitations and therefore of the N=50 shell gap. The inclusion of neutron configurations in the shell-model calculations results in an improved agreement between the experimental and calculated level energies at medium and high spin. These results highlight the considerable contribution of neutron-core particle-hole excitations across the N=50 shell gap to the level configurations. The overall agreement of the measured excited states with the shell-model predictions is indicative of the persistence of the N=50 shell gap down to Z=32.

High-spin states in the odd-odd 182Au nucleus have been investigated using the 152Sm (35Cl, 5nγ)182Au reaction through X-γ and γ-γ-t coincidence measurements. Rotational bands based on the πh9/2⊗νi13/2 and πi13/2⊗νi13/2 configurations have been identified. It is found that the two bands show characteristics of low-spin signature inversion. The observed signature inversion can be well reproduced by pairing-deformation self-consistent cranking Woods-Saxon calculations.