Triaxial projected shell model study of γ-vibrational bands in even-even Er isotopes

Sheikh, J. A.; Bhat, G. H.; Sun, Yang; Vakil, Gowher B.; Palit, R.

doi:10.1103/physrevc.77.034313

Cited by 67 publications

(59 citation statements)

References 32 publications

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“…All these interaction strengths are the same as those used in our earlier studies for the even-even nuclei in the same mass region [3,22,23,24]. Thus, we have a consistent description for doubly-even and doubly-odd nuclear systems.…”

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confidence: 90%

Triaxial projected shell model study of chiral rotation in odd–odd nuclei

2012

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Chiral rotation observed in128 Cs is studied using the newly developed microscopic triaxial projected shell model (TPSM) approach. The observed energy levels and the electromagnetic transition probabilities of the nearly degenerate chiral dipole bands in this isotope are well reproduced by the present model. This demonstrates the broad applicability of the TPSM approach, based on a schematic interaction and angular-momentum projection technique, to explain a variety of low-and high-spin phenomena in triaxial rotating nuclei.The classification of band structures from symmetry considerations has played a central role in our understanding of nuclear structure physics. Most of the rotational nuclei are axially symmetric with conserved angular-momentum projection along the symmetry axis. This symmetry has allowed to classify a multitude of rotational bands using Nilsson scheme and has been instrumental to unravel the intrinsic structures of deformed nuclei [1,2]. Although, most of the deformed nuclei obey axial symmetry at low-excitation energies and spin, there are also known regions of the periodic table, referred to as transitional nuclei, that violate axial symmetry and are described using the triaxial deformed mean-field. Further, some nuclei that are axial in the ground-state become triaxial at higher excitation energies and angular momenta. There are several empirical observations indicating that axial symmetry is broken in transitional regions. For instance, the moment of inertia of the transitional nuclei rises sharply with angular-momentum for

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confidence: 90%

Triaxial projected shell model study of chiral rotation in odd–odd nuclei

2012

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“…The purpose of the present work is to investigate the highspin properties of 76 Ge using the multi-quasiparticle (qp) triaxial projected shell model (TPSM) approach [13][14][15][16][17]. In the SSM analysis, the primary emphasis was on the low-lying states and the present investigation complements the results obtained by the SSM approach.…”

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confidence: 97%

Nature ofγdeformation in Ge and Se nuclei and the triaxial projected shell model description

et al. 2014

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Recent experimental data have demonstrated that 76 Ge may be a rare example of a nucleus exhibiting rigid γ-deformation in the low-spin regime. In the present work, the experimental analysis is supported by microscopic calculations using the multi-quasiparticle triaxial projected shell model (TPSM) approach. It is shown that to best describe the data of both yrast and γ-vibrational bands in 76 Ge, a rigid-triaxial deformation parameter γ ≈ 30 • is required. TPSM calculations are discussed in conjunction with the experimental observations and also with the published results from the spherical shell model. The occurrence of a γγ-band in 76 Ge is predicted with the bandhead at an excitation energy of ∼ 2.5 MeV. We have also performed TPSM study for the neighboring Ge-and Se-isotopes and the distinct γ-soft feature in these nuclei is shown to result from configuration mixing of the ground-state with multi-quasiparticle states.

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“…It has been demonstrated to provide excellent description of the observed properties [33][34][35][36]. In a more recent development, this model has been extended to study the observed band structures in odd-odd 128 Cs nucleus and it has been shown to reproduce the properties of chiral bands quite well, in particular, the observed trend of B(E2) transition probabilities [36].…”

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confidence: 97%