High-spin states in Ce127 and Ce129: Further evidence for triaxial nuclear shapes

E. S. Paul, J. P. Revill, M. Mustafa, S. V. Rigby, A. J. Boston, C. Foin, J. Genevey, A. Gizon, J. Gizon, I. M. Hibbert, D. T. Joss, P. J. Nolan, B. M. Nyakó, N. J. O'Brien, C. M. Parry, A. T. Semple, S. L. Shepherd, J. Timár, R. Wadsworth, L. Zolnai

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High-spin states have been studied in the neutron-deficient odd-N Ce127 and Ce129 isotopes, produced in Mo100(S32,5nγ) and Mo100(S34,5nγ) reactions, using the Euroball and Eurogam γ-ray spectrometers, respectively. A quadruples analysis (γ4) of the coincident γ-ray data has established new band structures in Ce127,129 and extended the known bands to higher spin. In addition, links have been established between two positive-parity bands in Ce127 allowing a reassignment of Iπ=1/2+ to the ground state of this nucleus. Configuration assignments are made by comparison of band properties with cranked Woods-Saxon calculations and systematics of other light odd-N cerium isotopes. Unusually large signature splitting in the negative-parity bands is discussed in terms of nonaxial nuclear shapes induced by the core-polarization effects of h11/2 neutrons.

Original languageEnglish
Article number054312
JournalPhysical Review C - Nuclear Physics
Issue number5
Publication statusPublished - Nov 19 2009


ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Paul, E. S., Revill, J. P., Mustafa, M., Rigby, S. V., Boston, A. J., Foin, C., Genevey, J., Gizon, A., Gizon, J., Hibbert, I. M., Joss, D. T., Nolan, P. J., Nyakó, B. M., O'Brien, N. J., Parry, C. M., Semple, A. T., Shepherd, S. L., Timár, J., Wadsworth, R., & Zolnai, L. (2009). High-spin states in Ce127 and Ce129: Further evidence for triaxial nuclear shapes. Physical Review C - Nuclear Physics, 80(5), [054312]. https://doi.org/10.1103/PhysRevC.80.054312