K-Mixing and fast decay of a seven-quasiparticle isomer in 179Ta
Kondev, F. G. ; Dracoulis, G. D. ; Lane, G. J. ; Ahmad, I. ; Byrne, A. P. ; Carpenter, M. P. ; Chowdhury, P. ; Freeman, S. J. ; Hammond, N. J. ; Janssens, R. V. F. ; Kibédi, T. ; Lauritsen, T. ; Lister, C. J. ; Mukherjee, G. ; Seweryniak, D. ; Tandel, S. K.
Springer
Published 2004
Springer
Published 2004
ISSN: |
1434-601X
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Source: |
Springer Online Journal Archives 1860-2000
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Topics: |
Physics
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Notes: |
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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Type of Medium: |
Electronic Resource
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URL: |