A K=3 two-quasiparticle isomer in 98Sr

G. Lhersonneau, B. Pfeiffer, R. Capote, J. M. Quesada, H. Gabelmann, and K.-L. Kratz
Phys. Rev. C 65, 024318 – Published 25 January 2002
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Abstract

The decay of on-line mass-separated 98Rb to 98Sr is studied by γ spectroscopy. The revised decay scheme adds further evidence of the coexistence of very different shapes in 98Sr. A set of levels is proposed to originate from particle-hole pair excitations across the Z=40 spherical gap in analogy with 96Sr. A deformed K=3 band with probable even parity is built on a 7.1-ns isomer at 1838 keV. It is interpreted as a two-quasineutron excitation in accordance with a quantum Monte Carlo pairing calculation based on a deformed shell model. Configurations of the calculated lowest-lying two-quasiparticle levels confirm the importance of the [404]9/2 neutron orbital at the largest deformations in the neutron-rich A100 region.

  • Received 17 September 2001

DOI:https://doi.org/10.1103/PhysRevC.65.024318

©2002 American Physical Society

Authors & Affiliations

G. Lhersonneau1,*, B. Pfeiffer2, R. Capote3,4, J. M. Quesada3, H. Gabelmann2,†, and K.-L. Kratz2,5

  • 1Department of Physics, University of Jyväskylä, P.O. Box. 35, FIN-40351 Jyväskylä, Finland
  • 2Institut für Kernchemie, Universität Mainz, D-55128 Mainz, Germany
  • 3Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla, Facultad de Física, Apdo 1065, 41080 Sevilla, España
  • 4Centro de Estudios Aplicados al Desarrollo Nuclear, Apdo 100, Miramar, La Habana, Cuba
  • 5CERN, CH-1211 Geneva 23, Switzerland

  • *Present address: LNL-INFN, Legnaro, Italy.
  • Present address: KSM-Analytik, Mainz, Germany.

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Vol. 65, Iss. 2 — February 2002

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