Phys. Rev. C 56, 142–153 (1997)Competing single-particle and collective structures in 86NbReceived 25 November 1996; published in the issue dated July 1997 The high-spin structure of odd-odd 86Nb was studied with the early implementation of GAMMASPHERE using 36 Compton-suppressed Ge detectors and the MICROBALL, a 95-element full-sphere charged-particle detector array. High-spin states were populated using the 58Ni(32S,3pn) reaction at 135 MeV with beams from the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory. A number of bands were observed up to spins as high as (31-). The yrast positive-parity band shares many characteristics with the πg9/2⊗νg9/2 bands in other odd-odd f-p-g shell nuclei. These similarities include the behavior of the moments of inertia, the magnitude and phase of the signature splitting and its phase reversal near the 10+ state, and the strong alternations in the B(M1)/B(E2) strengths. The moments of inertia in the lowest pair of negative-parity bands start out with a sharp upbend and then gradually fall back to the rigid-body value. New positive- and negative-parity bands appear in the quasiparticle alignment region and eventually become yrast. Some additional positive-parity states around spin 17ħ are candidates for fully or nearly fully aligned shell-model-like configurations. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.56.142
DOI:
10.1103/PhysRevC.56.142
PACS:
23.20.En, 23.20.Lv, 25.70.Gh, 27.50.+e
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