A MICROSCOPIC PERSPECTIVE ON STRUCTURE OF YRAST BANDS IN 100-112Ru ISOTOPES

Bhat, Arvind; Bharti, Arun; Khosa, S. K.

doi:10.1142/s0218301312500309

Cited by 7 publications

(5 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this work, we choose G 1 = 16.22 MeV and G 2 = 22.68 MeV; with these pairing strengths we approximately reproduce the experimental odd-even mass differences in this region. The quadrupole pairing strength G Q is assumed to be proportional to G M , and the proportionality constant was set to 0.18 [32,48]. The single-particle basis is that of the deformed Nilsson Hamiltonian parametrized in terms of axial (ε) and triaxial (ε ) deformations related to the standard Bohr triaxiality parameter γ by γ = arctan(ε /ε).…”

Section: B Triaxial Projected Shell Modelmentioning

confidence: 99%

“…The pairing strengths have been parametrized as in Refs. [32,48] in terms of two constants G 1 and G 2 . In this work, we choose G 1 = 16.22 MeV and G 2 = 22.68 MeV; with these pairing strengths we approximately reproduce the experimental odd-even mass differences in this region.…”

Section: B Triaxial Projected Shell Modelmentioning

confidence: 99%

“…For that reason, those nuclei are candidates for the presence of novel collective modes associated with triaxial rotation, such as wobbling motion and chiral bands [8,9]. The angular momentum alignment pattern in the lowest bands of Mo and Ru isotopes was also explored within the projected shell model approach [32,33]. The axial study [32] provided a reasonable description of yrast spectra and electromagnetic properties of 100−112 Ru.…”

Section: Introductionmentioning

confidence: 99%

“…The angular momentum alignment pattern in the lowest bands of Mo and Ru isotopes was also explored within the projected shell model approach [32,33]. The axial study [32] provided a reasonable description of yrast spectra and electromagnetic properties of 100−112 Ru. This work was extended in Ref.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Theoretical study of triaxial shapes of neutron-rich Mo and Ru nuclei

et al. 2015

View full text Add to dashboard Cite

Background: Whether atomic nuclei can possess triaxial shapes at their ground states is still a subject of ongoing debate. According to theory, good prospects for low-spin triaxiality are in the neutron-rich Mo-Ru region. Recently, transition quadrupole moments in rotational bands of even-mass neutron-rich isotopes of molybdenum and ruthenium nuclei have been measured. The new data have provided a challenge for theoretical descriptions invoking stable triaxial deformations.Purpose: To understand experimental data on rotational bands in the neutron-rich Mo-Ru region, we carried out theoretical analysis of moments of inertia, shapes, and transition quadrupole moments of neutron-rich even-even nuclei around 110 Ru using self-consistent mean-field and shell model techniques.Methods: To describe yrast structures in Mo and Ru isotopes, we use nuclear Density Functional Theory (DFT) with the optimized energy density functional UNEDF0. We also apply Triaxial Projected Shell Model (TPSM) to describe yrast and positive-parity, near-yrast band structures.Results: Our self-consistent DFT calculations predict triaxial ground-state deformations in 106,108 Mo and 108.110,112 Ru and reproduce the observed low-frequency behavior of moments of inertia. As the rotational frequency increases, a negative-γ structure, associated with the aligned ν(h 11/2 ) 2 pair, becomes energetically favored. The computed transition quadrupole moments vary with angular momentum, which reflects deformation changes with rotation; those variations are consistent with experiment. The TPSM calculations explain the observed band structures assuming stable triaxial shapes. Conclusions:The structure of neutron-rich even-even nuclei around 110 Ru is consistent with triaxial shape deformations. Our DFT and TPSM frameworks provide a consistent and complementary description of experimental data.

show abstract

Section: B Triaxial Projected Shell Modelmentioning

confidence: 99%

Section: B Triaxial Projected Shell Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Theoretical study of triaxial shapes of neutron-rich Mo and Ru nuclei

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Theoretically, various methods [15,[24][25][26][27][28][29][30][31][32][33] have been devoted to investigate the evolution of the triaxiality in Ru isotopes. Using the macroscopic-microscopic finiterange liquid-drop model (FRLDM), Möller et al, have identified 108 Ru as having the largest effects of triaxial deformation, ∼ 0.7 MeV, on the ground-state energy [24,25].…”

Section: Introductionmentioning

confidence: 99%

Microscopic description of triaxiality in Ru isotopes with covariant energy density functional theory

Shi

2018

Phys. Rev. C

View full text Add to dashboard Cite

Background: The triaxiality in nuclear low-lying states has attracted great interests for many years. Recently, the reduced transition probabilities for levels near the ground state in 110 Ru have been measured and provided strong evidences for a triaxial shape of this nucleus.Purpose: The aim of this work is to provide a microscopic study of low-lying states for the Ru isotopes with A ∼ 100 and to examine in detail the role of triaxiality, and the evolution of quadrupole shapes with the isospin and spin degrees of freedom. Method:The low-lying excitation spectra and transition probabilities of even-even Ru isotopes are described at the beyond mean-field level by solving a five-dimensional collective Hamiltonian with parameters determined by constrained self-consistent mean-field calculations based on the relativistic energy density functional PC-PK1.Results: The calculated energy surfaces, low-energy spectra, intraband and interband transition rates, as well as some characteristic collective observables, such as E(4 + g.s. )/E(2 + g.s. ), E(2 + γ )/E(4 + g.s. ), B(E2; 2 + g.s. → 0 + g.s. ), and γ band staggerings are in a good agreement with the available experimental data. Conclusions:The main features of the experimental low-lying excitation spectra and electric transition rates are well reproduced, and thus strongly support the onset of triaxiality in the low-lying excited states of the Ru isotopes around 110 Ru.

show abstract