Rotational Bands in the Semi-magic Nucleus 57Ni

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Two rotational bands have been identified and characterized in the proton-magic N = Z + 1 nucleus Ni-57. These bands complete the systematics of well-and superdeformed rotational bands in the light nickel isotopes starting from doubly magic Ni-56 to Ni-60. High-spin states in Ni-57 have been produced in the fusion-evaporation reaction Si-28(S-32, 2p1n)Ni-57 and studied with the gamma-ray detection array GAMMASPHERE operated in conjunction with detectors for evaporated light charged particles and neutrons. The features of the rotational bands in Ni-57 are compared to those of neighbouring isotopes and interpreted by means of configuration-dependent cranked Nilsson-Strutinsky calculations. The two observed high-spin bands are considered signature partners and assigned to configurations with one 1g(9/2) proton and one 1g(9/2) neutron, resulting in an unambiguous understanding of the energetically favoured signature alpha = -1/2 band but a somewhat less satisfactory description of the signature alpha = +1/2 band.


  • Dirk Rudolph
  • Ingemar Ragnarsson
  • W. Reviol
  • Corina Andreoiu
  • M. A. Bentley
  • M. P. Carpenter
  • R. J. Charity
  • R. M. Clark
  • M. Cromaz
  • Jörgen Ekman
  • Claes Fahlander
  • P. Fallon
  • E. Ideguchi
  • A. O. Macchiavelli
  • Milena Mineva
  • D. G. Sarantites
  • D. Seweryniak
  • S. J. Williams
Enheter & grupper

Ämnesklassifikation (UKÄ) – OBLIGATORISK

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TidskriftJournal of Physics G: Nuclear and Particle Physics
Utgåva nummer7
StatusPublished - 2010
Peer review utfördJa