Effects of the isoscalar and isovector interaction on the ground-state magnetic moments of odd-mass 137–145Ce nuclei

2019 ◽  
Vol 97 (11) ◽  
pp. 1187-1190
Author(s):  
H. Yakut ◽  
E. Tabar ◽  
G. Hoşgör
Keyword(s):  
Ground State ◽  
Magnetic Moments ◽  
The Other ◽  
Spin Interaction ◽  
Nuclear Model ◽  
Isotopic Chain ◽  
Core Polarization ◽  
Polarization Effects ◽  
The Core

A systematic study of the magnetic properties of deformed odd-neutron 137–145Ce isotopes using the microscopic quasiparticle phonon nuclear model (QPNM) has been presented. The QPNM includes residual spin–spin interaction in both isoscalar and isovector channels. The analysis shows that in the isoscalar channel contributions to the magnetic moment coming from the neutron and proton systems practically cancel out each other. On the other hand, in the isovector channel, the coherent contribution coming from the quasiparticle–phonon interactions leads to a spin polarization (core polarization), which is important for determination of the quenched spin gyromagnetic factors (gs). The quenched spin gyromagnetic factors so called [Formula: see text] have been found to range from [Formula: see text] to [Formula: see text] in the odd-mass 137–145Ce isotopic chain, which is similar to its phenomenological value ([Formula: see text] between [Formula: see text] and [Formula: see text]). By taking into consideration the core polarization effects, the available experimental data are satisfactorily reproduced with an accuracy of 0.01μN–0.1μN.

GROUND STATE MAGNETIC PROPERTIES OF ODD NEUTRON DY ISOTOPES

2013 ◽  
Vol 22 (10) ◽  
pp. 1350076 ◽  
Author(s):  
HAKAN YAKUT ◽  
EMRE TABAR ◽  
ALI AKBAR KULIEV ◽  
ZEMINE ZENGINERLER ◽  
PINAR KAPLAN
Keyword(s):  
Magnetic Properties ◽  
Ground State ◽  
Magnetic Moments ◽  
Spin Interaction ◽  
Nuclear Model ◽  
Free Nucleon ◽  
Core Polarization ◽  
The Core ◽  
Spin Interactions ◽  
Good Reproduction

Using the quasiparticle phonon nuclear model (QPNM) and taking into account the spin–spin interaction, the effects of the spin polarization on spin gyromagnetic factors (gs) as well as the intrinsic magnetic moments (gK) of the deformed odd neutron155-165Dy isotopes were studied. The calculated values of gsand gKare in fair agreement with the experiment as well as with other microscopic calculations. Our calculations indicated that because of the core polarization, the gsfactors of the nucleons in the nucleus reduce noticeably from its free nucleon value and the spin–spin interactions play an important role in the explanation of the quenching of the gsfactors. A very good reproduction of the phenomenological quenching of gsfactor from its free values [Formula: see text] is obtained for155-165Dy .

The ground-state magnetic moments of odd-mass Hf isotopes

Open Physics ◽  
2014 ◽  
Vol 12 (12) ◽  
Author(s):  
Hakan Yakut ◽  
Emre Tabar ◽  
A. Kuliev ◽  
Ekber Guliyev
Keyword(s):  
Spin Polarization ◽  
Ground State ◽  
Magnetic Moments ◽  
Random Phase ◽  
Nuclear Model ◽  
Effective Spin ◽  
Quasiparticle Random Phase Approximation ◽  
Polarization Effects ◽  
Intrinsic Magnetic Moment ◽  
Spin Polarization Effects

AbstractIn 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 seff.) 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.

Microscopic description of ground state magnetic moment and low-lying magnetic dipole excitations in heavy odd-mass 181Ta nucleus

2016 ◽  
Vol 25 (08) ◽  
pp. 1650053 ◽  
Author(s):  
Emre Tabar ◽  
Hakan Yakut ◽  
Ali Akbar Kuliev
Keyword(s):  
Excited States ◽  
Magnetic Dipole ◽  
Ground State ◽  
Magnetic Moments ◽  
Nuclear Model ◽  
Spurious State ◽  
Restoration Method ◽  
State Mixing ◽  
Self Consistency

The ground state magnetic moments and the low-lying magnetic dipole (Ml) transitions from the ground to excited states in heavy deformed odd-mass [Formula: see text]Ta 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.

scholarly journals O2 State in 18 O by using Core – Polarization effects

2008 ◽  
pp. 66-72
Keyword(s):  
Perturbation Theory ◽  
Experimental Studies ◽  
Form Factors ◽  
Wave Model ◽  
Collective Model ◽  
Core Polarization ◽  
Polarization Effects ◽  
The Core ◽  
The Subject ◽  
Space Wave

Coulomb form factors for E0 transition in 18O are discussed taking into account core-polarization effects. These effects are taken into account through the collective model of Tassie and also through a microscopic perturbation theory including excitations up to 2p1f shell. Space wave model functions defined for the orbits 1 and 2125O nucleus has been the subject of extensive theoretical and experimental studies, which received much attention in last decade [Alex Brown et.al.2005]. The 18O system contains two neutrons in addition to the16O core distributed in the sd – shell. d1 are obtained from the diagonalization of the interaction Hamilonian of Wildenthal. The calculations include the 0 2state with excitation energies3.6337MeV. The core – polarization effects which incorporate the ollective model of Tassei describe the data very well for this state.

Determination of hyperon properties through the variational method considering the hyperfine interaction

2019 ◽  
Vol 28 (10) ◽  
pp. 1950087 ◽  
Author(s):  
S. M. Moosavi Nejad ◽  
A. Armat
Keyword(s):  
Experimental Data ◽  
Wave Function ◽  
Ground State ◽  
Radiative Decay ◽  
Magnetic Moments ◽  
Wave Functions ◽  
Decay Widths ◽  
Free Parameters ◽  
Theoretical Results

Performing a fit procedure on the hyperon masses, we first determine the free parameters in the Cornell-like hypercentral potential between the constituent quarks of hyperons in their ground state. To this end, using the variational principle, we apply the hyperspherical Hamiltonian including the Cornell-like hypercentral potential and the perturbation potentials due to the spin–spin, spin–isospin and isospin–isospin interactions between constituent quarks. In the following, we compute the hyperon magnetic moments as well as radiative decay widths of spin-3/2 hyperons using the spin-flavor wave function of hyperons. Our analysis shows acceptable consistencies between theoretical results and available experimental data. This leads to reliable wave functions for hyperons at their ground state.

Density functional theory is straying from the path toward the exact functional

Science ◽  
2017 ◽  
Vol 355 (6320) ◽  
pp. 49-52 ◽  
Author(s):  
Michael G. Medvedev ◽  
Ivan S. Bushmarinov ◽  
Jianwei Sun ◽  
John P. Perdew ◽  
Konstantin A. Lyssenko
Keyword(s):  
Density Functional Theory ◽  
Density Distribution ◽  
Ground State ◽  
Electron Density Distribution ◽  
Density Functional ◽  
Electron System ◽  
The Other ◽  
Functional Theory ◽  
The Core ◽  
Exact Density

The theorems at the core of density functional theory (DFT) state that the energy of a many-electron system in its ground state is fully defined by its electron density distribution. This connection is made via the exact functional for the energy, which minimizes at the exact density. For years, DFT development focused on energies, implicitly assuming that functionals producing better energies become better approximations of the exact functional. We examined the other side of the coin: the energy-minimizing electron densities for atomic species, as produced by 128 historical and modern DFT functionals. We found that these densities became closer to the exact ones, reflecting theoretical advances, until the early 2000s, when this trend was reversed by unconstrained functionals sacrificing physical rigor for the flexibility of empirical fitting.

Electric Field Driven Interlayer Polarization Effects in Ferromagnetic 2D Van Der Waals Graphene/CrBr3 Heterostructure

2019 ◽  
Author(s):  
Sushant Kumar Behera ◽  
Pritam Deb
Keyword(s):  
Electric Field ◽  
Magnetic Moment ◽  
Ground State ◽  
Electronic Device ◽  
Magnetic Behaviour ◽  
Spin Interaction ◽  
Polarization Effects ◽  
Ferromagnetic Ground State ◽  
Device Applications ◽  
Interlayer Polarization

<div>2D vdW heterostructures are realized promising in nano-electronics due to their tunable electronic and magnetic behaviour. Modelling of ferromagnet/non-metal combination is worth to study electronic properties. We studied external electric field tuned electronic structure and magnetic moment variation in the framework of ferromagnetic ground state ordering non-spin interaction. The heterostructure system exhibits tenability in electronic bandgap. Similarly, the magnetic moment shows minor fluctuation in its value due to interlayer polarization. This is beneficial to be extended further for interesting quantum behaviour of phase change and suitability of the system in electronic device applications.</div>

Electric Field Driven Interlayer Polarization Effects in Ferromagnetic 2D Van Der Waals Graphene/CrBr3 Heterostructure

2019 ◽  
Author(s):  
Sushant Kumar Behera ◽  
Pritam Deb
Keyword(s):  
Electric Field ◽  
Magnetic Moment ◽  
Ground State ◽  
Electronic Device ◽  
Magnetic Behaviour ◽  
Spin Interaction ◽  
Polarization Effects ◽  
Ferromagnetic Ground State ◽  
Device Applications ◽  
Interlayer Polarization

<div>2D vdW heterostructures are realized promising in nano-electronics due to their tunable electronic and magnetic behaviour. Modelling of ferromagnet/non-metal combination is worth to study electronic properties. We studied external electric field tuned electronic structure and magnetic moment variation in the framework of ferromagnetic ground state ordering non-spin interaction. The heterostructure system exhibits tenability in electronic bandgap. Similarly, the magnetic moment shows minor fluctuation in its value due to interlayer polarization. This is beneficial to be extended further for interesting quantum behaviour of phase change and suitability of the system in electronic device applications.</div>

scholarly journals First-Principles Study on Stability and Magnetism ofNimAln(m=1–3,n=1–9) Clusters

2013 ◽  
Vol 2013 ◽  
pp. 1-9
Author(s):  
Xiao Zhang ◽  
Bao-Xing Li ◽  
Zhi-wei Ma ◽  
Jiao-jiao Gu
Keyword(s):  
Ground State ◽  
First Principles ◽  
Population Analysis ◽  
Magnetic Moments ◽  
Three Dimensional ◽  
The Other ◽  
Mulliken Population Analysis ◽  
Mixed Species ◽  
Mulliken Population ◽  
Ground State Structures

The investigation on the structures, stabilities, and magnetism ofNimAln(m=1–3,n=1–9) clusters has been made by using first principles. We found some new ground-state structures which had not been found before. These mixed species prefer to adopt three-dimensional (3D) structures starting from four atoms. All the ground-state structures for the Ni-Al clusters are different from those of the corresponding pure Al clusters with the same number of atoms except for three atoms. The Mulliken population analysis shows that some charges transfer from the Al atoms to the Ni atoms.NiAln(n = odd number) cations, Ni2Al6neutral, Ni2Al1and Ni3Al cations and anions, and Ni3Al5anion have the magnetic moments of 2 μB. The magnetic moments of NiAl4and NiAl6cluster neutrals and cations are 2 μBand 3 μB, respectively. All the other cluster neutrals and ions do not have any nontrivial magnetic moments. The 3d electrons in Ni atoms are mainly responsible for the magnetism of the mixed Ni-Al clusters.

Sign in / Sign up

Export Citation Format

Share Document