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Identification of isomeric states in the N=73 neutron-deficient nuclei 132Pr and 130La
Taylor M.J., Alharshan G.A., Cullen D.M., Procter M.G., Lumley N.M. et al
Physical Review C 86 (2012) 44310 - http://hal.in2p3.fr/in2p3-00761217
Physique/Physique Nucléaire Expérimentale
Identification of isomeric states in the N=73 neutron-deficient nuclei 132Pr and 130La
M. J. Taylor1, G. A. Alharshan, D. M. Cullen, M. G. Procter, N. M. Lumley, T. Grahn, P. T. Greenlees, K. Hauschild2, A. Herzan, U. Jakobsson, P. Jones, R. Julin, S. Juutinen, S. Ketelhut, M. Leino, A. Lopez-Martens2, P. Nieminen, J. Partanen, P. Peura, P. Rahkila, S. Rinta-Antila, P. Ruotsalainen, M. Sandzelius, J. Sarén, C. Scholey, J. Sorri, S. Stolze, J. Uusitalo, F. R. Xu, Z. J. Bai
1 :  Department of Physics
Utah State University
2 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
CNRS : UMR8609 – IN2P3 – Université Paris XI - Paris Sud
batiments 104 et 108 - 91405 Orsay Campus
Decays from isomeric states in the neutron-deficient N=73 nuclei 132Pr and 130La have been observed for the first time. Half-lives of 486(70) ns and 2.46(4) μs were measured for two isomeric states in 132Pr. The decay from the 486 ns (8‑) isomer has been interpreted as a hindered E1 transition from the bandhead state of the excited πh11/2⊗νg7/2 configuration. The decay from the 2.5 μs (8+) isomer is consistent with the Weisskopf estimate for a low-energy E2 transition. An analogous 0.74(3) μs decay from an (8+) isomer in the neighboring isotone 130La has also been observed which similarly can be explained if the transition has E2 character. The Weisskopf interpretation for the isomer hindrance is strengthened by the lack of evidence for shape or K isomerism due to the γ-soft shapes predicted by configuration-constrained potential-energy-surface calculations.

Articles dans des revues avec comité de lecture
Physical Review C (Phys. Rev. C)
Publisher American Physical Society
ISSN 0556-2813 (eISSN : 1089-490X)

Isomer decay – gamma transitions and level energies – Lifetimes – 90<=A<=149