First observation of rotational bands in the nucleus 231U

D. G. Roux, R. A. Bark, E. A. Lawrie, J. J. Lawrie, S. S. Ntshangase, T. S. Dinoko, J. L. Easton, P. Jones, B. V. Kheswa, N. A. Khumalo, S. N.T. Majola, L. P. Masiteng, D. Negi, S. P. Noncolela, J. Ndayishimye, J. F. Sharpey-Schafer, O. Shirinda, P. C. Uwitonze

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This work reports the first rotational bands observed in the neutron-deficient nucleus 231U. Excited states were populated in the 232Th(α,5n) reaction at a beam energy of 52 MeV. Coincident decay γ-rays were measured with the high-purity germanium detectors of the afrodite spectrometer array, in conjunction with a recoil detector to discriminate against the fission background. The bands are interpreted as the ground-state band ν[633]5/2+, yrast band ν[752]5/2-, and an excited band ν[631]3/2+. Configuration assignments are supported by Cranked Shell Model and B(M1)/B(E2) calculations. The excitation energy of the ν[752]5/2- bandhead is suggested to be 113.0 keV.

Original languageEnglish
Article number118
JournalEuropean Physical Journal A
Issue number5
Publication statusPublished - May 2024
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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