β decaying T1/2=3.4 s isomer in 69Ni

J. I. Prisciandaro, P. F. Mantica, A. M. Oros-Peusquens, D. W. Anthony, M. Huhta, P. A. Lofy, and R. M. Ronningen
Phys. Rev. C 60, 054307 – Published 27 September 1999
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Abstract

A radioactive beam of 69Ni was produced by the fragmentation of a 70 MeV/nucleon 76Ge beam in a Be target. β-delayed γ-ray studies were performed using two thin plastic scintillators and two large-volume Ge detectors following implantation of the 69Ni nuclei into a foil of a collection wheel apparatus. A 1296-keV γ-ray transition with a half-life of 3.4(7) s was identified and has been attributed to the decay of the νp1/21 isomeric state in 69Ni. The relative population of the low-spin Jπ=1/2 isomer to the known high-spin Jπ=(17/2) isomer was determined to be 6:1 for the production of 69Ni via fragmentation of 76Ge, based on an upper limit of 36% extracted for the 69Nim1 β-decay branch to the 3/2 ground state of 69Cu. The half-life and branching of the 69Nim1 β decay is discussed in light of possible two particle–two hole excitations in the low-energy structure of 69Cu.

  • Received 15 March 1999

DOI:https://doi.org/10.1103/PhysRevC.60.054307

©1999 American Physical Society

Authors & Affiliations

J. I. Prisciandaro1,2, P. F. Mantica1,2, A. M. Oros-Peusquens1,*, D. W. Anthony1,2, M. Huhta1, P. A. Lofy1,2, and R. M. Ronningen1

  • 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
  • 2Department of Chemistry, Michigan State University, East Lansing, Michigan 48824

  • *Permanent address: Institute of Nuclear Physics and Engineering Horia Hulubei, Bucharest-Măgurele, Romania.

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Vol. 60, Iss. 5 — November 1999

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