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>68</mml:mn></mml:mmultiscripts></mml:math>

Suchyta, S.; Liddick, S. N.; Tsunoda, Y.; Otsuka, T.; Bennett, Michael B.; Chemey, Alexander T.; Honma, Mareki; Larson, N.; Prokop, C. J.; Quinn, S. J.; Shimizu, Noritaka; Simón, A.; Spyrou, A.; Tripathi, Vandana; Utsuno, Yutaka; VonMoss, J. M.

doi:10.1103/physrevc.89.021301

Cited by 77 publications

(75 citation statements)

References 39 publications

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“…[23], which predict the 3 − level almost 600 keV above, leaves no clear interpretation for this state. In 68 Ni and 70 Ni, intruder levels attributed to strongly deformed bands have recently been observed [7,9], and their energies have been positively predicted by the Monte Carlo shell-model calculations of Tsunoda et al [2] after explicitly including proton excitations across the Z = 28 shell gap. These crossed-core excitations have also been pointed to as the main factor in the development of deformation in 40 N 50 nuclei below Ni (see Ref.…”

Section: Comparison With Shell-model Calculationsmentioning

confidence: 99%

“…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%

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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: Comparison With Shell-model Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-lying excitations inNi72

Morales¹,

Benzoni²,

Watanabe³

et al. 2016

Phys. Rev. C

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“…A possible reason could be the enforcement of spherical symmetry in our calculations. Recent experiments have revealed the coexistence of spherical ground states and axially deformed states with excitation energies below 3 MeV in 68 Ni and its vicinity [183][184][185]. In the next subsection, we will discuss examples in which the MR-IMSRG(2) successfully deals with the presence of both spherical and deformed states in the spectrum of neon isotopes, but we note that the states in question have much larger energetic separations of 7 − 8 MeV.…”

Section: Calcium and Nickel Isotopesmentioning

confidence: 99%

In-medium similarity renormalization group for closed and open-shell nuclei

Hergert¹

2016

Phys. Scr.

145

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Abstract. We present a pedagogical introduction to the In-Medium Similarity Renormalization Group (IMSRG) framework for ab initio calculations of nuclei. The IMSRG performs continuous unitary transformations of the nuclear many-body Hamiltonian in second-quantized form, which can be implemented with polynomial computational effort. Through suitably chosen generators, it is possible to extract eigenvalues of the Hamiltonian in a given nucleus, or drive the Hamiltonian matrix in configuration space to specific structures, e.g., band-or block-diagonal form.Exploiting this flexibility, we describe two complementary approaches for the description of closed-and open-shell nuclei: The first is the Multireference IMSRG (MR-IMSRG), which is designed for the efficient calculation of nuclear ground-state properties. The second is the derivation of nonempirical valence-space interactions that can be used as input for nuclear Shell model (i.e., configuration interaction (CI)) calculations. This IMSRG+Shell model approach provides immediate access to excitation spectra, transitions, etc., but is limited in applicability by the factorial cost of the CI calculations.We review applications of the MR-IMSRG and IMSRG+Shell model approaches to the calculation of ground-state properties for the oxygen, calcium, and nickel isotopic chains or the spectroscopy of nuclei in the lower sd shell, respectively, and present selected new results, e.g., for the ground-and excited state properties of neon isotopes.Submitted to: Phys. Scr.

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“…Large-scale Shell Model calculations using the Lenzi-Nowacki-Poves-Sieja (LNPS) interaction [3,[5][6][7] Thanks to the great effort put into studying this particular nucleus over the recent decades shape coexistence in 68 Ni is well established both from an experimental [3,[9][10][11][12] and a theoretical point of view [3,5,8]. But the situation is not that clear for nuclei around it.…”

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confidence: 99%