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Journal ArticleDOI

Systematic investigation of the low-energy dipole excitations in 176,178,180Hf within rotational, translational and Galilean invariant quasiparticle RPA

TL;DR: In this article, low-energy magnetic and electric dipole excitations in the even-even isotopes 176−180Hf have been systematically studied within the rotational, translational and Galilean invariant Quasiparticle Random Phase Approximation (QRPA).
About: This article is published in Nuclear Physics.The article was published on 2013-10-03. It has received 19 citations till now. The article focuses on the topics: Dipole & Magnetic dipole.
Citations
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01 Apr 2001
TL;DR: In this paper, the reduced electric quadrupole transition probability, B(E2)↑, from the ground state to the first-excited 2+ state of even-even nuclides are given in Table I.
Abstract: Adopted values for the reduced electric quadrupole transition probability, B(E2)↑, from the ground state to the first-excited 2+ state of even–even nuclides are given in Table I. Values of τ, the mean life of the 2+ state; E, the energy; and β, the quadrupole deformation parameter, are also listed there. The ratio of β to the value expected from the single-particle model is presented. The intrinsic quadrupole moment, Q0, is deduced from the B(E2)↑ value. The product E×B(E2)↑ is expressed as a percentage of the energy-weighted total and isoscalar E2 sum-rule strengths. Table II presents the data on which Table I is based, namely the experimental results for B(E2)↑ values with quoted uncertainties. Information is also given on the quantity measured and the method used. The literature has been covered to November 2000. The adopted B(E2)↑ values are compared in Table III with the values given by systematics and by various theoretical models. Predictions of unmeasured B(E2)↑ values are also given in Table III.

955 citations

Journal ArticleDOI
TL;DR: In this article, the ground state magnetic moments and the low-lying magnetic dipole transitions from the ground to excited states in heavy deformed odd-mass 181Ta have been microscopically investigated on the basis of the quasiparticle-phonon nuclear model.
Abstract: The ground state magnetic moments and the low-lying magnetic dipole (Ml) transitions from the ground to excited states in heavy deformed odd-mass 181Ta have been microscopically investigated on the basis of the quasiparticle-phonon nuclear model (QPNM). The problem of the spurious state mixing in M1 excitations is overcome by a restoration method allowing a self-consistent determination of the separable effective restoration forces. Due to the self-consistency of the method, these effective forces contain no arbitrary parameters. The results of calculations are compared with the available experimental data, the agreement being reasonably satisfactory.

21 citations

Journal ArticleDOI
E. Tabar1, H. Yakut1, A. A. Kuliev, G. Hoşgör1, E. Kemah1, H. Quliyev1 
TL;DR: The method of Pyatov, proposed for the exclusion of the spurious states associated with the spontaneous symmetry breaking due to the mean field approximation, is applied to restore broken translation and Galilean invariance of the Quasiparticle Phonon Nuclear Model (QPNM) Hamiltonian of deformed odd-mass nuclei for the first time as discussed by the authors.

18 citations

Journal ArticleDOI
TL;DR: In this paper, a self-consistent determination of the separable effective restoration forces is adapted to odd-mass nuclei in order to restore violated rotational invariance (RI-) of the Quasiparticle Phonon Nuclear Model (QPNM) Hamiltonian.

16 citations

Journal ArticleDOI
TL;DR: In this article, the spin polarization effects of the even core on the magnetic moments were investigated and it was shown that the spin-spin interactions play an important role in the re-normalization of the ground state magnetic properties of the odd-mass 165-179Hf isotopes.
Abstract: In this paper the Quasiparticle-Phonon Nuclear Model (QPNM), based on QRPA (Quasiparticle Random Phase Approximation) phonons, has been utilized to investigate spin polarization effects on the groundstate magnetic properties such as intrinsic magnetic moment (g K ) and effective spin gyromagnetic factor (g . ) of odd-mass deformed 165–179Hf isotopes with K > 1/2. Investigations of the spin polarization effects of the even core on the magnetic moments show that the spin gyromagnetic factors (g s ) of the nucleons in the nucleus differ noticeably from the corresponding values for free nucleons and that the spin-spin interactions play an important role in the re-normalization of g s factors of the odd-mass 165–179Hf isotopes. In addition, some theoretical predictions are presented for the magnetic moments of 165Hf, 167Hf, and 169Hf, whose ground state magnetic moments haven’t been experimentally determined yet.

15 citations

References
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Journal ArticleDOI

1,868 citations

Journal ArticleDOI
TL;DR: In this paper, the reduced electric quadrupole transition probability, B(E2)↑, from the ground state to the first-excited 2+ state of even-even nuclides are given in Table I.

1,113 citations

01 Apr 2001
TL;DR: In this paper, the reduced electric quadrupole transition probability, B(E2)↑, from the ground state to the first-excited 2+ state of even-even nuclides are given in Table I.
Abstract: Adopted values for the reduced electric quadrupole transition probability, B(E2)↑, from the ground state to the first-excited 2+ state of even–even nuclides are given in Table I. Values of τ, the mean life of the 2+ state; E, the energy; and β, the quadrupole deformation parameter, are also listed there. The ratio of β to the value expected from the single-particle model is presented. The intrinsic quadrupole moment, Q0, is deduced from the B(E2)↑ value. The product E×B(E2)↑ is expressed as a percentage of the energy-weighted total and isoscalar E2 sum-rule strengths. Table II presents the data on which Table I is based, namely the experimental results for B(E2)↑ values with quoted uncertainties. Information is also given on the quantity measured and the method used. The literature has been covered to November 2000. The adopted B(E2)↑ values are compared in Table III with the values given by systematics and by various theoretical models. Predictions of unmeasured B(E2)↑ values are also given in Table III.

955 citations

Journal ArticleDOI
01 Jan 1987
TL;DR: In this article, the reduced electric quadrupole transition probability, B(E2)up-arrow, from the ground state to the first-excited 2/sup +/ state of even-even nuclides are given in Table I.
Abstract: Adopted values for the reduced electric quadrupole transition probability, B(E2)up-arrow, from the ground state to the first-excited 2/sup +/ state of even-even nuclides are given in Table I. Values of tau, the mean life of the 2/sup +/ state, E, the energy, and ..beta../sub 2/, the quadrupole deformation parameter, are also listed there. The ratio of ..beta../sub 2/ to the value expected from the single-particle model is presented. The intrinsic quadrupole moment, Q/sub O/, is deduced from the B(E2)up-arrow value. The product E x B(E2)up-arrow is expressed as a precentage of the energy-weighted total and isoscalar E2 sum-rule strengths.

670 citations

Journal ArticleDOI
TL;DR: In this paper, the discovery of a new collective magnetic dipole excitation mode in high-resolution inelastic electron scattering on 64 156 Gd is discussed in terms of a geometrical two-rotor model and the interacting boson model.

491 citations