Isomers of astrophysical interest in neutron-deficient nuclei at masses A = 81, 85 and 86

  • A. Kankainen
  • G. K. Vorobjev
  • S. A. Eliseev
  • W. Huang
  • J. Huikari
  • A. Jokinen
  • A. Nieminen
  • Yu. N. Novikov
  • H. Penttilä
  • A. V. Popov
  • S. Rinta-Antila
  • H. Schatz
  • D. M. Seliverstov
  • Yu. P. Suslov
  • J. Äystö
Original Article

Abstract.

Decay properties of neutron-deficient exotic nuclei close to A=80 have been investigated at the IGISOL facility. The studied nuclei, 81Y, 81Sr, 81mKr, 85Nb, 85Zr, 86Mo and 86Nb, were produced by a 32S beam from the Jyväskylä isochronous cyclotron on 54Fe and natNi targets. The internal conversion coefficient for a 190.5 keV isomeric transition in 81mKr has been measured and the internal transition rate has been determined. The internal transition rate has been used to estimate a neutrino capture rate on 81Br, which yields a log ft of 5.13±0.09 for the reaction 81Br( ν, e-)81mKr. A new isomer with a half-life of 3.3±0.9 s has been observed in 85Nb. The existence of an earlier reported isomer with a half-life of 56 s in 86Nb has not been confirmed.

PACS.

21.10.Tg Lifetimes 23.20.Nx Internal conversion and extranuclear effects 27.50.+e 59 ⩽ A ⩽ 89 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2005

Authors and Affiliations

  • A. Kankainen
    • 1
  • G. K. Vorobjev
    • 2
    • 3
  • S. A. Eliseev
    • 3
    • 4
  • W. Huang
    • 1
  • J. Huikari
    • 1
  • A. Jokinen
    • 1
  • A. Nieminen
    • 1
  • Yu. N. Novikov
    • 2
    • 3
  • H. Penttilä
    • 1
  • A. V. Popov
    • 3
  • S. Rinta-Antila
    • 1
  • H. Schatz
    • 5
  • D. M. Seliverstov
    • 3
  • Yu. P. Suslov
    • 2
  • J. Äystö
    • 1
  1. 1.Department of PhysicsUniversity of JyväskyläFinland
  2. 2.St. Petersburg State UniversitySt. PetersburgRussia
  3. 3.Petersburg Nuclear Physics InstituteGatchinaRussia
  4. 4.GSIDarmstadtGermany
  5. 5.Michigan State UniversityEast LansingUSA

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