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Gaudefroy, L.; Daugas, J. M.; Hass, M.; Grévy, S.; Stödel, C.; Thomas, J. C.; Perrot, L.; Girod, M.; Rossé, B.; Angélique, J. C.; Balabanski, D. L.; Fiori, Enrico; Force, C.; Георгиев, Г.; Kameda, D.; Kumar, V.; Lozeva, R.; Matéa, I.; Méot, V.; Morel, Pascal; Singh, B. S. Nara; Nowacki, F.; Simpson, G. S.

doi:10.1103/physrevlett.102.092501

Cited by 79 publications

(100 citation statements)

References 23 publications

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“…The roots of this discord remain to be understood. Eventually, the spectroscopy of 60 Ca with Z=20 and N=40 should further our understanding of harmonic oscillator shell e↵ects at the neutron dripline [65][66][67].…”

Section: And This Work (Color Online)mentioning

confidence: 99%

Are There Signatures of Harmonic Oscillator Shells Far from Stability? First Spectroscopy of Zr110

Paul¹,

Corsi²,

Obertelli³

et al. 2017

Phys. Rev. Lett.

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The first measurement of the low-lying states of the neutron-rich 110 Zr and 112 Mo was performed via in-beam -ray spectroscopy after one proton removal on hydrogen at ⇠200 MeV/nucleon. The 2 + 1 excitation energies were found at 185(11) keV in 110 Zr, and 235(7) keV in 112 Mo, while the R42=E(4 + 1 )/E(2 + 1 ) ratios are 3.1(2), close to the rigid rotor value, and 2.7(1), respectively. These results are compared to modern energy density functional based configuration mixing models using Gogny and Skyrme e↵ective interactions. We conclude that first levels of 110 Zr exhibit a rotational behavior, in agreement with previous observations of lighter zirconium isotopes as well as with the most advanced Monte Carlo Shell Model predictions. The data therefore do not support a harmonic oscillator shell stabilization scenario at Z=40 and N=70. The present data also invalidate predictions for a tetrahedral ground state symmetry in 110 Zr.Nuclei, like atoms, manifest quantized energy states that can be interpreted in terms of an underlying shell structure-a convenient but non-observable theoretical construct [1,2]. Within the classical picture, large gaps between adjacent shells give rise to particularly stable configurations whose proton and neutron numbers are traditionally called "magic" [3]. The magic numbers for stable nuclei were first successfully described by invoking a one-body square-well and spin-orbit potential [4,5]; the latter was eventually replaced by a harmonic oscillator potential with l 2 term to obtain proper angular momentum splittings [6]. However, studies of radioactive nuclei over the past decades have shown that the magic numbers are not universal across the nuclear chart [7][8][9][10]. Despite intensive e↵ort, the theoretical description of these structural changes is not yet fully understood and the mechanisms that drive structural evolution di↵er between models. Within

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Section: And This Work (Color Online)mentioning

confidence: 99%

Are There Signatures of Harmonic Oscillator Shells Far from Stability? First Spectroscopy of Zr110

Paul¹,

Corsi²,

Obertelli³

et al. 2017

Phys. Rev. Lett.

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“…Recent progress in ion beam facilities provides the technical possibility of exploring nuclei with extreme proton-to-neutron ratios, far from the valley of stability. Experimental results on mass, nuclear radius, and spectroscopy, obtained in the last decade, indicate that location and magnitude of the shell gaps in the neighbourhood of the valley of stability may change, giving rise to new magic numbers; see, e.g., [444,445]. Evidently, the study of the nuclear shell gaps, far from the stable isotopes, provides a new impetus for the development of nuclear structure theory.…”

Section: Signatures Of Symmetry Breaking In Nuclear Structurementioning

confidence: 99%

Effects of symmetry breaking in finite quantum systems

2013

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The review considers the peculiarities of symmetry breaking and symmetry transformations and the related physical effects in finite quantum systems. Some types of symmetry in finite systems can be broken only asymptotically. However, with a sufficiently large number of particles, crossover transitions become sharp, so that symmetry breaking happens similarly to that in macroscopic systems. This concerns, in particular, global gauge symmetry breaking, related to Bose-Einstein condensation and superconductivity, or isotropy breaking, related to the generation of quantum vortices, and the stratification in multicomponent mixtures. A special type of symmetry transformation, characteristic only for finite systems, is the change of shape symmetry. These phenomena are illustrated by the examples of several typical mesoscopic systems, such as trapped atoms, quantum dots, atomic nuclei, and metallic grains. The specific features of the review are: (i) the emphasis on the peculiarities of the symmetry breaking in finite mesoscopic systems; (ii) the analysis of common properties of physically different finite quantum systems; (iii) the manifestations of symmetry breaking in the spectra of collective excitations in finite quantum systems. The analysis of these features allows for the better understanding of the intimate relation between the type of symmetry and other physical properties of quantum systems. This also makes it possible to predict new effects by employing the analogies between finite quantum systems of different physical nature.

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“…These effects are included in the SDPF-MU effective shell-model interaction introduced in [3] and the resulting predictions for the 40,41,42 S level schemes will be tested in the present work. The sulfur isotopes between N = 20 and N = 28 have been studied with a variety of experimental techniques [10][11][12][13][14][15][16][17][18][19][20], however, information on the level schemes even at low excitation energy is still scarce. Beyond N = 28, very few excited states have been reported in the S isotopic chain [21,22].…”

Section: Introductionmentioning

confidence: 99%

In-beam γ -ray spectroscopy of S38–42

et al. 2016

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The low-energy excitation level schemes of the neutron-rich 38−42 S isotopes are investigated via in-beam γ-ray spectroscopy following the fragmentation of 48 Ca and 46 Ar projectiles on a 12 C target at intermediate beam energies. Information on γγ coincidences complemented by comparisons to shell-model calculations were used to construct level schemes for these neutron-rich nuclei. The experimental data are discussed in the context of large-scale shell-model calculations with the SDPF-MU effective interaction in the sd-pf shell. For the even-mass S isotopes, the evolution of the yrast sequence is explored as well as a peculiar change in decay pattern of the second 2 + states at N = 26. For the odd-mass 41 S, a level scheme is presented that seems complete below 2.2 MeV and consistent with the predictions by the SDPF-MU shell-model Hamiltonian; this is a remarkable benchmark given the rapid shell and shape evolution at play in the S isotopes as the broken-down N = 28 magic number is approached. Furthermore, the population of excited final states in projectile fragmentation is discussed.

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Shell Erosion and Shape Coexistence inS271643

Cited by 79 publications

References 23 publications

Are There Signatures of Harmonic Oscillator Shells Far from Stability? First Spectroscopy of Zr110

Are There Signatures of Harmonic Oscillator Shells Far from Stability? First Spectroscopy of Zr110

Effects of symmetry breaking in finite quantum systems

In-beam γ -ray spectroscopy of S38–42

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