Low-spin states in 
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 populated in the 
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 decay of the 
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Sekal, S.; Fraile, L. M.; Lică, R.; Borge, M. J. G.; Walters, W. B.; Aprahamian, A.; Benchouk, C.; Bernards, C.; Briz, J. A.; Bucher, B.; Chiara, C. J.; Dlouhý, Z.; Gheorghe, I.; Ghiţă, D.; Hoff, P.; Jolie, J.; Köster, U.; Kurcewicz, W.; Mach, H.; Mărginean, N.; Mărginean, R.; Méliani, Z.; Paziy, V.; Régis, J.-M.; Rudigier, M.; Sava, T.; Simpson, G. S.; Stănoiu, M.; Stroe, L.

doi:10.1103/physrevc.104.024317

Cited by 8 publications

(4 citation statements)

References 42 publications

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“…A recent β-decay experiment [20] also found no evidence of the proposed low-lying 0 + 2 state. Detailed information of the 80 Ge level scheme comes from β-decay [20,21] studies, while the isomeric 8 + 1 state was identified in a deep inelastic scattering measurement [22]. The lifetime of the 8 + 1 state was measured using fast-timing techniques [23].…”

Section: Introductionmentioning

confidence: 86%

“…This was subsequently refuted by another measurement searching for the conversion electron emitted by the reported 0 + 2 state's E0 decay [19]. A recent β-decay experiment [20] also found no evidence of the proposed low-lying 0 + 2 state. Detailed information of the 80 Ge level scheme comes from β-decay [20,21] studies, while the isomeric 8 + 1 state was identified in a deep inelastic scattering measurement [22].…”

Section: Introductionmentioning

confidence: 97%

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Evolution of shape and collectivity along the Ge isotopic chain: The case of Ge80

et al. 2022

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The shape and collectivity of 80 Ge were investigated via a sub-barrier-energy Coulomb excitation measurement using the JANUS setup at the NSCL ReA3 facility. The 80 Ge spectroscopic quadrupole moment Qs(2 + 1 ) of the 2 + 1 state was measured for the first time, and the precision of the 80 Ge B(E2; 0 + 1 → 2 + 1 ) transition strength was increased. The experimental Qs(2 + 1 ) value indicates a large, prolate deformation for 80 Ge, which is consistent with large-scale shell-model calculations performed for comparison. These results provide important benchmarks for models that try to describe nuclear shape in neutron rich nuclei near the magic number N = 50.

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Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 97%

Evolution of shape and collectivity along the Ge isotopic chain: The case of Ge80

et al. 2022

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“…Whether or not there are low-lying excited 0 + states in, e.g., 82 Ge and 150 Er, would be worth exploring. The situation at N = 48, i.e., in 80 Ge, is of two contradicting reports [179,180] and a very recent result that casts further doubt on the existence of a low-energy excited 0 + state in 80 Ge [181]; unlike at Z = 48 (the Cd isotopes) where low energy deformed excited 0 + states are well established (see, e.g., [41,116]). 79 Zn is from Orlandi et al [182] and Yang et al [183].…”

Section: E(mev) Nmentioning

confidence: 98%

To Shell Model, or Not to Shell Model, That Is the Question

Stuchbery

Wood

2022

Physics

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The present review takes steps from the domain of the shell model into open shell nuclei. The question posed in the title is to dramatize how far shell model approaches, i.e., many nucleons occupying independent-particle configurations and interacting through two-body forces (a configuration interaction problem) can provide a description of nuclei as one explores the structure observed where neither proton nor neutron numbers match closed shells. Features of doubly closed and singly closed shell nuclei and adjacent nuclei are sketched, together with the roles played by seniority, shape coexistence, triaxial shapes and particle–core coupling in organizing data. An illuminating step is taken here to provide a detailed study the reduced transition rates, B(E2;21+→01+), in the singly closed shell nuclei with doubly closed shell plus or minus a pair of identical nucleons, and the confrontation between such data and state-of-the-art shell model calculations: this amounts to a review of the effective charge problem. The results raise many questions and point to the need for much further work. Some guidance on criteria for sharpening the division between the domain of the shell model and that of deformation-based descriptions of nuclei are provided. The paper is closed with a sketch of a promising direction in terms of the algebraic structure embodied in the symplectic shell model.

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“…The nuclei in the Germanium (Ge) region around the neutron number N = 40 is among the challenging regions of the nuclear chart, and have been of great interests for recent theoretical [27][28][29][30][31][32] and experimental studies [33][34][35][36][37][38]. Their low-lying states are characterized by a * knomura@phy.hr rich variety of nuclear structure phenomena, represented by a rapid shape evolution from one nucleus to another, which includes the emergence of the neutron N = 40 subshell closure around 72 Ge, the competition between multiple intrinsic shapes in the vicinity of the ground state within a single nucleus, i.e., shape coexistence [35,39], and the triaxial deformation around 76,78 Ge [33,36].…”

Section: Introductionmentioning

confidence: 99%

$β$ decay and evolution of low-lying structure in Ge and As nuclei

Nomura

2022

Preprint

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We present a simultaneous calculation for the shape evolution and the related spectroscopic properties of the low-lying states, and the β-decay properties in the even-and odd-mass Ge and As nuclei in the mass A ≈ 70 − 80 region, within the framework of the nuclear density functional theory and the particle-core coupling scheme. The constrained self-consistent mean-field calculations using a universal energy density functional (EDF) and a pairing interaction determines the interactingboson Hamiltonian for the even-even core nuclei, and the essential ingredients of the particle-boson interactions for the odd-nucleon systems, and of the Gamow-Teller and Fermi transition operators. A rapid structural evolution from γ-soft oblate to prolate shapes, as well as the spherical-oblate shape coexistence around the neutron sub-shell closure N = 40, is suggested to occur in the eveneven Ge nuclei. The predicted low-energy spectra, electromagnetic transition rates, and β-decay log f t values are in a reasonable agreement with experiment. The predicted log f t values reflect the structures of the wave functions for the initial and final nuclei of β decay, which are to a large extent determined by the microscopic input provided by the underlying EDF calculation.

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Low-spin states in Ge80 populated in the β decay of the Ga80

Cited by 8 publications

References 42 publications

Evolution of shape and collectivity along the Ge isotopic chain: The case of Ge80

Evolution of shape and collectivity along the Ge isotopic chain: The case of Ge80

To Shell Model, or Not to Shell Model, That Is the Question

$β$ decay and evolution of low-lying structure in Ge and As nuclei

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