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Phys. Rev. C 67, 034316 (2003) [16 pages]

Lifetime measurements and terminating structures in 87Nb

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J. Pavan1, S. L. Tabor1, A. V. Afanasjev2,3, C. Baktash4, F. Cristancho5, M. Devlin6, J. Döring2,*, C. J. Gross7, G. D. Johns8, R. A. Kaye1,†, D. R. LaFosse6, I. Y. Lee9, F. Lerma6, A. O. Macchiavelli9, I. Ragnarsson10, D. G. Sarantites6, and G. N. Solomon1
1Department of Physics, Florida State University, Tallahassee, Florida 32306
2Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556
3Laboratory of Radiation Physics, Institute of Solid State Physics, University of Latvia, LV-1063 Riga, Latvia
4Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
5Departmento de Física, Universidad Nacional de Colombia, Bogotá, Colombia
6Chemistry Department, Washington University, St. Louis, Missouri 63130
7UNISOR, Oak Ridge Institute of Science and Education, Oak Ridge, Tennessee 37831
8Los Alamos National Laboratory, Los Alamos, New Mexico 87545
9Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
10Department of Mathematical Physics, Lund Institute of Technology, S-21100 Lund, Sweden

Received 23 September 2002; published 25 March 2003

Two experiments have been performed using the 58Ni(32S,3p) reaction at 135 MeV with Gammasphere and the Microball to study the high-spin structure of the transitional nucleus 87Nb. The first experiment using a thin target provided a considerable extension and refinement of the level scheme, as well as firm spin assignments from directional correlation of oriented nuclei. Sub-picosecond lifetimes were measured in the second backed-target experiment using the Doppler-shift attenuation method. The lifetimes imply a rather modest average deformation of β2∼0.1, but with considerable variation from state to state. Strong alternations were observed in the B(M1) strengths of transitions between some pairs of bands. The experimental results were compared with calculations performed within the cranked Nilsson-Strutinsky approach. The calculations generally reproduce the irregularities in the structure of the yrast lines and plunging transition quadrupole moments Qt within the bands explaining them as reflections of configuration changes and an approach of band termination, respectively.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.67.034316
DOI:
10.1103/PhysRevC.67.034316
PACS:
21.10.Tg, 27.50.+e, 21.10.Ky, 21.60.Ev

*Present address: GSI, 64291 Darmstadt, Germany.

†Present address: Department of Chemistry and Physics, Purdue University Calumet, Hammond, IN 46323.

 
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