Rotational Bands in the Semi-magic Nucleus 57Ni

Summary, in English

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.

• Author: 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
• Department/s: Nuclear physics; Mathematical Physics
• Publishing year: 2010
• Language: English
• Publication/Series: Journal of Physics G: Nuclear and Particle Physics
• Volume: 37
• Issue: 7
• Links: http://dx.doi.org/10.1088/0954-3899/37/7/075105
• Document type: Journal article
• Publisher: IOP Publishing
• Topic: Subatomic Physics; Physical Sciences
• Status: Published
• Research group: Nuclear Structure
• ISBN/ISSN/Other: ISSN: 0954-3899