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 band structures in 184Au have been re-investigated using the multidetector array of GASP following the 149Sm (29Si, 4nγ) 184Au reaction. Four previously observed bands built on prolate configurations have been extended significantly up to high spins and two weakly populated bands are newly identified. Structure properties of these bands are briefly discussed.

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.

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.

High-spin states in 179Au have been studied experimentally using the 149Sm (35Cl,5n) fusion-evaporation reaction at beam energies of 164−180 MeV. A rotational band built on the 1/2[660](i13/2) Nilsson orbital has been established for 179Au. Properties of the 1/2 [660](i13/2) bands in the odd-A Au nuclei are discussed with an emphasis on the evolution of bandhead energy and deformation while changing neutron number.