Search results for "isospin symmetry breaking"

showing 3 items of 3 documents

Beta-Decay Studies in N ≈ Z Nuclei Using No-Core Configuration-Interaction Model

2015

The no-core configuration-interaction model based on the isospin- and angular-momentum projected density functional formalism is introduced. Two applications of the model are presented: (i) determination of spectra of 0+ states in 62Zn and (ii) determination of isospin-symmetry-breaking corrections to superallowed β-decay between isobaric-analogue 0+ states in 38Ca and 38K. It is shown that, without readjusting a single parameter of the underlying Skyrme interaction, in all three nuclei, the model reproduces the 0+ spectra surprisingly well. peerReviewed

Nuclear Theorysuperallowed Fermi β-decaytiheysfunktionaaliteoriaisospin symmetry breakingNuclear Experimentconfiguration-interaction model
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Isospin-symmetry breaking in masses of ≃ Nuclei

2018

Effects of the isospin-symmetry breaking (ISB) beyond mean-field Coulomb terms are systematically studied in nuclear masses near the N=Z line. The Coulomb exchange contributions are calculated exactly. We use extended Skyrme energy density functionals (EDFs) with proton–neutron-mixed densities, to which we add new terms breaking the isospin symmetry. Two parameters associated with the new terms are determined by fitting mirror and triplet displacement energies (MDEs and TDEs) of isospin multiplets. The new EDFs reproduce MDEs for the T=12 doublets and T=1 triplets, and TDEs for the T=1 triplets. Relative strengths of the obtained isospin-symmetry-breaking terms are not consistent with the d…

Nuclear and High Energy PhysicsParticle physicsprotonitNuclear TheoryTriplet displacement energy (TDE)01 natural sciencesComputer Science::Digital LibrariesDisplacement (vector)Energy density functional (EDF)Proton–neutron mixingproton–neutron mixingnuclear physicstiheysmirror displacement energy (MDE)0103 physical sciencesCoulombSymmetry breaking010306 general physicsnuclear density functional theory (DFT)density functional theoryLine (formation)Physicsdensityenergiata114protons010308 nuclear & particles physicsScatteringtiheysfunktionaaliteorianeutronsneutronitenergy density functional (EDF)lcsh:QC1-999Symmetry (physics)Isospin symmetry breaking (ISB)Isospintriplet displacement energy (TDE)isospin symmetry breaking (ISB)ydinfysiikkaMirror displacement energy (MDE)Parametrizationlcsh:PhysicsenergyPhysics Letters
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Strong-interaction Isospin-symmetry Breaking Within the Density Functional Theory

2015

The conventional Skyrme interaction is generalized by adding zero-range charge-symmetry-breaking and charge-independence-breaking terms, and the corresponding energy density functional is derived. It is shown that the extended model accounts for experimental values of mirror and triplet displacement energies (MDEs and TDEs) in sd-shell isospin triplets with, on average, about 100~keV precision using only two additional adjustable coupling constants. Moreover, the model is able to reproduce, for the first time, the A=4n versus A=4n+2 staggering of the TDEs.

PhysicsCoupling constantta114Nuclear TheoryEnergy density functionalStrong interactiontiheysfunktionaaliteoriaFOS: Physical sciencesGeneral Physics and AstronomySkyrme interactionDisplacement (vector)Nuclear Theory (nucl-th)isospin symmetryExtended modelIsospinQuantum mechanicsDensity functional theoryisospin symmetry breakingSymmetry breakingdensity functional theory
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