Crossing of single-particle energy levels resulting from neutron excess in the sd shell

Storm, M H; Watt, Alexander; Whitehead, R.R.

doi:10.1088/0305-4616/9/8/004

Cited by 42 publications

(22 citation statements)

References 11 publications

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“…Shortly thereafter it was shown (68,69) that the discrepancy between experiment and shell-model theory could be diminished by inclusion of excitations from the ν(d 3/2 ) shell into the ν( f 7/2 ) shell. A mass measurement of 31,32 Mg (70), although somewhat ambiguous (71), and a confirmation of the location of the first excited state in 32 Mg (48) provided additional experimental evidence of a sharp onset of deformation for N = 20 isotones below 34 Si.…”

Section: Neutron F 7/2 Intruder States Around 32 Mgmentioning

confidence: 99%

Coulomb Excitation at Intermediate Energies

Glasmacher

1998

Annu. Rev. Nucl. Part. Sci.

158

119

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The experimental technique of intermediate-energy Coulomb excitation allows for in-beam γ -ray spectroscopy of β-unstable nuclei far from stability with low beam intensities. Measurements of excitation energies and electric multipole moments in neutron-rich nuclei in the π (sd ) shell have provided experimental data that can be compared to shell-model and microscopic calculations, extending our knowledge of the evolution of nuclear shells as the nuclear driplines are approached.

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Section: Neutron F 7/2 Intruder States Around 32 Mgmentioning

confidence: 99%

Coulomb Excitation at Intermediate Energies

Glasmacher

1998

Annu. Rev. Nucl. Part. Sci.

158

119

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“…The authors found that "the gap between and shells shows a moderate decrease from E=7230 keV in to 5115 keV in This is in contrast to Storm", Watt and Whitehead (1983) who "predict that the gap actually becomes negative for Hence, the authors quoted "three important mechanisms which combine to give the inversion of relative to the (small) reduction in the single-particle gap, the increase in the pairing energy and the increase in the proton-neutron interaction energy This latter interaction, led to collective-like states with increased interaction energy. They calculated "effective neutron single-particle energies" of the various orbits in the and shells.…”

Section: Fifty Years Of the Shell Model 237mentioning

confidence: 87%

“…They plotted "the differences among the centroids of the" two types of configurations for N = 20 and found, apparently in contrast to Storm, Watt and Whitehead (1983), that it went down with Z. The reason for the effect becoming less important for Z = 8, 9 was explained by the authors.…”

Section: Fifty Years Of the Shell Model 235mentioning

confidence: 97%

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Advances in Nuclear Physics, Volume 27

Baranger¹,

Vogt²,

Seth³

2003

Advances in Nuclear Physics

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A Continuation Order Plan is available for this series. A continuation order will bring delivery of each new volume immediately upon publication. Volumes are billed only upon actual shipment. For further information please contact the publisher. High Spin Properties of Atomic Nuclei • D. Ward and P. Fallon The Deuteron: Structure and Form Factors • M. Garçon and J. W. Van Orden Articles Published in Earlier Volumes ixThis volume contains two major articles, one providing a historical retrospective of one of the great triumphs of nuclear physics in the twentieth century and the other providing a didactic introduction to one of the quantitative tools for understanding strong interactions in the twenty-first century.The article by Igal Talmi on "Fifty Years of the Shell Model -the Quest for the Effective Interaction", pertains to a model that has dominated nuclear physics since its infancy and that developed with astonishing results over the next five decades. Talmi is uniquely positioned to trace the history of the Shell Model. He was active in developing the ideas at the shell model's inception, he has been central in most of the subsequent initiatives which expanded, clarified and applied the shell model and he has remained active in the field to the present time. Wisely, he has chosen to restrict his review to the dominating issue: the choice of the effective interactions among valence nucleons that determine the properties of low lying nuclear energy levels.The treatment of the subject is both bold and novel for our series. The ideas pertaining to the effective interaction for the shell model are elucidated in a historical sequence. In a massive article, which will be valued both for its completeness and its sound judgment of the various contributions to the subject, Talmi succeeds without use of a single figure comparing model results with each other or with experimental data. Instead, the compelling flow of ideas and results for the Shell Model are described in a manner that makes clear why this magnificent edifice has had such great resilience. Many of the ideas of the Shell Model are very elegant. They converge on a picture of nuclear states that is so all-encompassing that there has been very little room, so far, for the intrusion of subnucleon physics. Talmi takes us right up to the most recent decade in which very large computers have been able to verify and expand upon earlier views of the effective interaction by directly diagonalizing the matrices pertaining to the myriad of nuclear states that arise from several valence nucleons beyond closed shells. This review is then a celebration of a most successful model of atomic nuclei and of its underlying ideas. xi PREFACEThe second article of this volume is also massive and pertains to a subject that has become very important for the field. Chiral Perturbation Theory has been one of the few quantitative tools for coping with the theory of the strong interactions, QCD, which is both remarkably simple to express as a fundamental Lagrangian and notoriously ...

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“…Hence, the excitation energy of 9/2 + 1 in these nuclei is influenced directly by the location of the ν0g 9/2 orbit. Neutron effective single-particle energies (ESPEs) [88] in Cr and Fe isotopes are displayed in Fig. 9 using the present Hamiltonian.…”

Section: Fig 4 (Color Online) Comparison Between the Level Spacing mentioning

confidence: 99%

Large-scale shell-model calculations for unnatural-parity high-spin states in neutron-rich Cr and Fe isotopes

et al. 2015

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We investigate unnatural-parity high-spin states in neutron-rich Cr and Fe isotopes using large-scale shell-model calculations. These shell-model calculations are carried out within the model space of fp-shell + 0g 9/2 + 1d 5/2 orbits with the truncation allowing 1 ω excitation of a neutron. The effective Hamiltonian consists of GXPF1Br for fp-shell orbits and V MU with a modification for the other parts. The present shell-model calculations can describe and predict the energy levels of both natural-and unnatural-parity states up to the high-spin states in Cr and Fe isotopes with N 35. The total energy surfaces present prolate deformations on the whole and indicate that the excitation of one neutron into the 0g 9/2 orbit plays the role of enhancing prolate deformation. For positive (unnatural)-parity states in odd-mass Cr and Fe isotopes, their energy levels and prolate deformations indicate the decoupling limit of the particle-plus-rotor model. The sharp drop of the 9/2 + 1 levels in going from N = 29 to N = 35 in odd-mass Cr, Fe, and Ni isotopes is explained by the Fermi surface approaching the ν0g 9/2 orbit.

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Crossing of single-particle energy levels resulting from neutron excess in the sd shell

Cited by 42 publications

References 11 publications

Coulomb Excitation at Intermediate Energies

Coulomb Excitation at Intermediate Energies

Advances in Nuclear Physics, Volume 27

Large-scale shell-model calculations for unnatural-parity high-spin states in neutron-rich Cr and Fe isotopes

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