Transient-field g-factor measurement of the first 2+ states in the N=82 nuclei 140Ce, 142Nd and 144Sm

Bazzacco, D.; Brandolini, F.; Löwenich, K.; Pavan, P.; Rossi‐Alvarez, C.; Maglione, E.; Poli, M.; Haque, A. M. I.

doi:10.1016/0375-9474(91)90532-b

Cited by 15 publications

(9 citation statements)

References 10 publications

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“…The middle panel complements the excitation energies by the corresponding B(E2) values. These agree in the average fairly well with the experimental data (taken from [45,46,47,48,49,50,51,52,53]). However, there are substantial deviations in details: a dramatic drop at N=66 and 68 and a trend to overestimation towards shell closure N=82.…”

Section: Low Lying 2 + -Excitationssupporting

confidence: 85%

Systematics of collective correlation energies from self-consistent mean-field calculations

Klüpfel¹,

Erler²,

Reinhard³

et al. 2008

Eur. Phys. J. A

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Abstract. The collective ground-state correlations stemming from low-lying quadrupole excitations are computed microscopically. To that end, the self-consistent mean-field model is employed on the basis of the Skyrme-Hartre-Fock (SHF) functional augmented by BCS pairing. The microscopic-macroscopic mapping is achieved by quadrupole-constrained mean-field calculations which are processed further in the generator-coordinate method (GCM) at the level of the Gaussian overlap approximation (GOA). We study the correlation effects on energy, charge radii, and surface thickness for a great variety of semi-magic nuclei. A key issue is to work out the influence of variations of the SHF functional. We find that collective ground-state correlations (GSC) are robust under change of nuclear bulk properties (e.g., effective mass, symmetry energy) or of spin-orbit coupling. Some dependence on the pairing strength is observed. This, however, does not change the general conclusion that collective GSC obey a general pattern and that their magnitudes are rather independent of the actual SHF parameters.

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Section: Low Lying 2 + -Excitationssupporting

confidence: 85%

Systematics of collective correlation energies from self-consistent mean-field calculations

Klüpfel¹,

Erler²,

Reinhard³

et al. 2008

Eur. Phys. J. A

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“…Focusing on the range 51 ≤ Z ≤ 57, the g factor data in Figure 12, for both odd and even-A isotones, are near constant and thus consistent with a simple π1g n 7/2 structure in both the ground states (odd-Z) and 2 + 1 states (even-Z). The lowered experimental g( 2 + 1 ) values for 140 Ce, 142 Nd and 144 Sm have been attributed to increasing contributions from ν(1h −1 11/2 2 f 7/2 ) excitations [36]. Nevertheless, the basic seniority structure appears to persist in these nuclei.…”

Section: B(e2mentioning

confidence: 99%

“…Figure 23: Organization of the unique-parity states in 187 Ir associated with j = 9/2 intruder configuration in pattern due to Meyer-ter-Vehn [21]. The data are taken from [36], but the pattern was not recognized. 187 Ir associated with j = 9/2 intruder configuration into a "hyper-band" pattern due to Meyer-ter-Vehn [95,96].…”

Section: Irmentioning

confidence: 99%

“…However, it took thirty years to establish the lowest spherical state in 32 Mg [164], and to explore the structure as an excited state in the neighboring 34 Si [165]. It appears that nobody has yet shown an interest in looking at the underlying structure in 36 S, but it has been known for a long time in 38 Ar. Note that the deformed band in 38 Ar is nearly identical in energy spacing to the ground-state band in 32 Mg. Our message is that: to refer to the ground-state structure of 32 Mg as being part of an "island" is obscuring the discovery frontier of such structures, which must extend to higher excitation energies and broadly encompass nuclides in the region.…”

Section: Intruder Statesmentioning

confidence: 99%

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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 RIV g factor measurement on 136 Te is expected to be able to distinguish between these competing theoretical pictures, even though the radioactive beam intensity is two orders of magnitude weaker than for 132 Te. It is interesting to note that in the stable N = 84 nuclei 142 Ce and 144 Nd, the g( 2 + 1 ) values are clearly positive, although reduced to about 0.5Z/A [16,17].…”

Section: Introductionmentioning

confidence: 99%

Nuclear structure of neutron-rich nuclei near closed shells from excited-state g-factor measurements

Stuchbery

Mantica

2007

Eur. Phys. J. Spec. Top.

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Transient-field g-factor measurement of the first 2+ states in the N=82 nuclei 140Ce, 142Nd and 144Sm

Cited by 15 publications

References 10 publications

Systematics of collective correlation energies from self-consistent mean-field calculations

Systematics of collective correlation energies from self-consistent mean-field calculations

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

Nuclear structure of neutron-rich nuclei near closed shells from excited-state g-factor measurements

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