Changes in νg9/2 shape polarisation across the odd neutron-rich Cr isotopes

A. N. Deacon, S. J. Freeman, R. V F Janssens, F. R. Xu, M. P. Carpenter, I. R. Calderin, P. Chowdhury, N. J. Hammond, T. Lauritsen, C. J. Lister, D. Seweryniak, J. F. Smith, S. L. Tabor, B. J. Varley, S. Zhu

    Research output: Contribution to journalArticlepeer-review


    Excited states in 57Cr have been populated to high spin in the 14C(48Ca,αn) reaction at a beam energy of 130 MeV. A regular sequence of stretched quadrupole transitions has been established above the yrast 9/2+ level. This sequence is interpreted as a rotational band associated with prolate deformation induced by the excitation of the odd neutron into the 1/2+[440] orbital. Total Routhian surface calculations, which follow this configuration to high spin, reproduce the observed features of the band. They are also able to account for a similar, but less well developed structure in 55Cr. In contrast, the isomeric yrast 9/2+ state in 59Cr appears to be a band-head state dominated by the 9/2+[404] configuration, which is favoured at oblate deformations. Such a marked difference presents a significant challenge for theoretical descriptions, but is consistent with features exhibited by the low-lying negative-parity states in 59Cr. © 2005 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)151-158
    Number of pages7
    JournalPhysics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
    Issue number1-2
    Publication statusPublished - 25 Aug 2005


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