New low-energy<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mn>0</mml:mn><mml:mo>+</mml:mo></mml:msup></mml:math>state and shape coexistence in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Ni</mml:mi><mml:mprescripts /><mml:none /><mml:mn>70</mml:mn></mml:mmultiscripts></mml:math>

Prokop, C. J.; Crider, B. P.; Liddick, S. N.; Ayangeakaa, A. D.; Carpenter, M. P.; Carroll, J. J.; Chen, J.; Chiara, C. J.; David, H. M.; Dombos, A. C.; Go, S.; Harker, J.; Janssens, R. V. F.; Larson, N.; Lauritsen, T.; Lewis, R.; Quinn, S. J.; Recchia, F.; Seweryniak, D.; Spyrou, A.; Suchyta, S.; Walters, W. B.; Zhu, S.

doi:10.1103/physrevc.92.061302

Cited by 40 publications

(33 citation statements)

References 39 publications

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“…Accordingly, low-lying strongly deformed bands, stable against the spherical shape, are expected to appear in the neutron-rich Ni isotopes [2]. Nonyrast 0 + and 2 + states observed at relatively low excitation energies in 68 Ni and 70 Ni were interpreted as being ascribed to the deformed structures [6][7][8][9][10][11]. The next even-even isotope, 72 Ni, might be at the core of the region of shape coexistence in the Ni chain: At variance with some state-of-the-art shell-model approaches [4], recent Monte Carlo shell-model calculations [2] predict a deep prolate minimum in 72 Ni at the lowest excitation energy among the Ni isotopes.…”

Section: Introductionmentioning

confidence: 99%

Low-lying excitations inNi72

Morales¹,

Benzoni²,

Watanabe³

et al. 2016

Phys. Rev. C

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Low-lying excited states in 72 Ni have been investigated in an in-flight fission experiment at the RIBF facility of the RIKEN Nishina Center. The combination of the state-of-the-art BigRIPS and EURICA setups has allowed for a very accurate study of the β decay from 72 Co to 72 Ni, and has provided first experimental information on the decay sequence 72 Fe → 72 Co → 72 Ni and on the delayed neutron-emission branch 73 Co → 72 Ni. Accordingly, we report nearly 60 previously unobserved γ transitions which deexcite 21 new levels in 72 Ni. Evidence for the location of the so-sought-after (4 + 2 ), (6 + 2 ), and (8 + 1 ) seniority states is provided. As well, the existence of a low-spin β-decaying isomer in odd-odd neutron-rich Co isotopes is confirmed for mass A = 72. The new experimental information is compared to simple shell-model calculations including only neutron excitations across the fpg shells. It is shown that, in general, the calculations reproduce well the observed states.

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Section: Introductionmentioning

confidence: 99%

Low-lying excitations inNi72

Morales¹,

Benzoni²,

Watanabe³

et al. 2016

Phys. Rev. C

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“…But the situation is not that clear for nuclei around it. Shape coexistence has been proposed for the more exotic 70 Ni (N=42) at even lower energy [9,13,14], and also for 67 Co and 71 Cu (see Refs. [15,16] and references therein), but surprisingly not for the nuclei closer to stability.…”

mentioning

confidence: 99%

Search for shape-coexisting 0+ states in Ni66 from lifetime measurements

et al. 2017

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“…A similar shape-coexistence picture appears to be present in 70 Ni [6,11], but with the prolate minimum coming lower in excitation energy than in 68 Ni. It is worth not-ing that the MCSM calculations indicate that the prolate states require the inclusion of proton excitations across the Z = 28 shell gap in the wave functions [6,9,11]. Studies of high-spin states provide complementary information about the influence of the underlying shell structure on collective excitations.…”

Section: Introductionmentioning

confidence: 50%

“…However, comparisons between experimental branching ratios from various states and calculations reveal the importance of mixing in order to account for the observed patterns [7,10]. A similar shape-coexistence picture appears to be present in 70 Ni [6,11], but with the prolate minimum coming lower in excitation energy than in 68 Ni. It is worth not-ing that the MCSM calculations indicate that the prolate states require the inclusion of proton excitations across the Z = 28 shell gap in the wave functions [6,9,11].…”

Section: Introductionmentioning

confidence: 78%

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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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New low-energy0+state and shape coexistence inNi70

Cited by 40 publications

References 39 publications

Low-lying excitations inNi72

Low-lying excitations inNi72

Search for shape-coexisting 0+ states in Ni66 from lifetime measurements

Single-particle and collective excitations inNi62

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