Journal
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
Volume 37, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0954-3899/37/7/075105
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Funding
- Swedish Research Council
- US Department of Energy [DE-AC03-76SF00098, DE-FG05-88ER-40406, W-31-109-ENG38]
- Science and Technology Facilities Council [GR/T18486/01, ST/F012055/1] Funding Source: researchfish
- STFC [GR/T18486/01, ST/F012055/1] Funding Source: UKRI
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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.
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