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K-Mixing and fast decay of a seven-quasiparticle isomer in 179Ta

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Abstract.

A seven-quasiparticle isomer with \(K^{\pi} = (49 /2^ + )\) and T 1/2 = 53 ( + 3 -7) ns has been identified in 179Ta. By comparing its excitation energy with results from multi-quasiparticle calculations that include the effects of blocking and residual nucleon-nucleon interactions, the isomer is assigned the \(\pi^{3}\)(5/2 + [402], 7/2 + [404], \(9/2^{-}[514]) \otimes \nu^{4}\)(5/2-[512], 7/2-[514], 7/2-[503], 9/2 + [624]) configuration. The decay of this isomer is found to be unusually fast, a feature that is attributed to a mixing with a specific collective level. The interaction strength is found to be orders of magnitude lower than that observed between interacting collective levels.

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Authors and Affiliations

  1. Nuclear Engineering Division, Argonne National Laboratory, IL 60439, Argonne, USA

    F. G. Kondev

  2. Department of Nuclear Physics, R.S.Phys.S.E, Australian National University, ACT 0200, Canberra, Australia

    G. D. Dracoulis, G. J. Lane, A. P. Byrne & T. Kibédi

  3. Physics Division, Argonne National Laboratory, IL 60439, Argonne, USA

    I. Ahmad, M. P. Carpenter, S. J. Freeman, N. J. Hammond, R. V. F. Janssens, T. Lauritsen, C. J. Lister, G. Mukherjee & D. Seweryniak

  4. Department of Physics, The Faculties, Australian National University, ACT 0200, Canberra, Australia

    A. P. Byrne

  5. Department of Physics, University of Massachusetts, MA 01854, Lowell, USA

    P. Chowdhury, G. Mukherjee & S. K. Tandel

Authors
  1. F. G. Kondev
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  2. G. D. Dracoulis
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  3. G. J. Lane
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  4. I. Ahmad
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  5. A. P. Byrne
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  6. M. P. Carpenter
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  7. P. Chowdhury
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  8. S. J. Freeman
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  9. N. J. Hammond
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  10. R. V. F. Janssens
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  11. T. Kibédi
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  12. T. Lauritsen
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  13. C. J. Lister
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  14. G. Mukherjee
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  15. D. Seweryniak
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  16. S. K. Tandel
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Corresponding author

Correspondence to F. G. Kondev.

Additional information

Communicated by W. Henning

Received: 7 March 2004, Revised: 3 May 2004, Published online: 5 October 2004

PACS:

21.10.Re Collective levels - 21.10.Tg Lifetimes - 23.20.Lv Gamma transitions and level energies - 27.70. + q \(150 \leq A \leq 189\)

S.J. Freeman: Present address: Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK.

G . Mukherjee: Present address: Nuclear and Atomic Physics Division, Saha Institute of Nuclear Physics, Kolkata 700 064, India.

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Kondev, F.G., Dracoulis, G.D., Lane, G.J. et al. K-Mixing and fast decay of a seven-quasiparticle isomer in 179Ta. Eur. Phys. J. A 22, 23–27 (2004). https://doi.org/10.1140/epja/i2004-10025-9

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