Rotational bands near 56Ni

Reviol, W.; Sarantites, D. G.; Charity, R. J.; Tomov, V.; Rudolph, Dirk; Clark, R. M.; Cromaz, M.; Fallon, P.; Macchiavelli, A. O.; Carpenter, M. P.; Seweryniak, D.; Dobaczewski, J.

doi:10.1016/s0375-9474(00)00618-7

Cited by 9 publications

(17 citation statements)

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“…This can be understood from the fact that while there are four or five holes in the 1f 7/2 orbitals defining the underlying SD gap, there are only two particles in 1g 9/2 orbitals. Nevertheless, the deformation is consistent with the average quadrupole deformation reported in [28].…”

Section: Discussionsupporting

confidence: 90%

“…In conclusion, two SD bands have been observed in the N = Z + 1 nucleus 57 Ni in the reaction 28 Si( 32 S, 2pn) by means of prompt particle-γγ and -γγγ coincidence investigations using the Gammasphere Ge-detector array in conjunction with the Microball and Neutron Shell ancillary devices. Based on cranked NilssonStrutinsky calculations the two bands are interpreted as signature partners having the CNS configuration [21,21] in the spin range I = 10-20.…”

Section: Discussionmentioning

confidence: 93%

“…For the present study, all spectra and γγ correlation matrices and γγγ correlation cubes use the refined Doppler correction. In the work of Reviol et al [28], an average quadrupole moment for one of the bands in 57 Ni has been derived by investigating these additional Doppler shift effects in some more detail. While the suggested value of Q 0 = 2.3…”

Section: Experiments and Data Analysismentioning

confidence: 99%

“…Indeed, these studies form a proper basis for the present extension towards rotational high-spin states. Preliminary results on such a rotational band in 57 Ni have been presented in [28]. Section 2 provides information on the experimental approach and the data analysis, and the experimental results are the subject of Section 3.…”

Section: Introductionmentioning

confidence: 99%

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Rotational bands in the semi-magic nucleus⁵⁷₂₈Ni₂₉

Rudolph¹,

Ragnarsson²,

Reviol³

et al. 2010

J. Phys. G: Nucl. Part. Phys.

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Abstract. Two rotational bands have been identified and characterized in the proton-magic N = Z + 1 nucleus 57 Ni. These bands complete the systematics of well-and superdeformed rotational bands in the light nickel isotopes starting from doubly-magic 56 Ni to 60 Ni. High-spin states in 57 Ni have been produced in the fusion-evaporation reaction 28 Si( 32 S,2p1n) 57 Ni and studied with the γ-ray detection array Gammasphere operated in conjunction with detectors for evaporated light charged particles and neutrons. The features of the rotational bands in 57 Ni are compared to those of neighbouring isotopes and interpreted by means of configurationdependent 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 α = −1/2 band but a somewhat less satisfactory description of the signature α = +1/2 band.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 93%

Section: Experiments and Data Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rotational bands in the semi-magic nucleus⁵⁷₂₈Ni₂₉

Rudolph¹,

Ragnarsson²,

Reviol³

et al. 2010

J. Phys. G: Nucl. Part. Phys.

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“…Studies of high-spin states provide complementary information about the influence of the underlying shell structure on collective excitations. Rotational sequences have been reported at moderate and high spin in some of the Ni isotopes: highly-deformed and even superdeformed bands, built upon lower-lying single-particle excitations, have been observed in doubly-magic 56 Ni [12,13], as well as in 57 Ni [14,15], 58 Ni [16][17][18], 59 Ni [19], 60 Ni [20,21], and 63 Ni [22]. Most of the bands have been associated with configurations involving the alignment of the spin of several particles with the rotational axis.…”

Section: Introductionmentioning

confidence: 99%

Single-particle and collective excitations inNi62

et al. 2016

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Background: Level sequences of rotational character have been observed in several nuclei in the A = 60 mass region. The importance of the deformation-driving πf 7/2 and νg 9/2 orbitals on the onset of nuclear deformation is stressed. Purpose: A measurement was performed in order to identify collective rotational structures in the relatively neutron-rich 62 Ni isotope. Method:The 26 Mg( 48 Ca,2α4nγ) 62 Ni complex reaction at beam energies between 275 and 320 MeV was utilized. Reaction products were identified in mass (A) and charge (Z) with the Fragment Mass Analyzer (FMA) and γ rays were detected with the Gammasphere array. Results: Two collective bands, built upon states of single-particle character, were identified and sizable deformation was assigned to both sequences based on the measured transitional quadrupole moments, herewith quantifying the deformation at high spin. Conclusions: Based on Cranked Nilsson-Strutinsky calculations and comparisons with deformed bands in the A = 60 mass region, the two rotational bands are understood as being associated with configurations involving multiple f 7/2 protons and g 9/2 neutrons, driving the nucleus to sizable prolate deformation.

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