Emergence of pygmy dipole resonances: Magic numbers and neutron skins

Abstract

The pygmy dipole resonances (PDR) for even-even nuclei in 8=<Z=<40 are studied performing a systematic calculation of the random-phase approximation with the Skyrme functional of SkM*. The calculation is fully self-consistent and does not assume any symmetry in the nuclear shape of the ground state. In every isotopic chain, the PDR emerges by showing a peak of the E1 strength at energies less than 10 MeV. The E1 strength of the PDR strongly depends on the position of the Fermi level and shows a clear correlation with the occupation of the orbits with the orbital angular momenta less than 3\hbar (l =< 2). We also found a strong correlation between the isotopic dependence of the neutron skin thickness and the pygmy dipole strength. The fraction of the energy weighted strength exhausted by the PDR and the neutron skin thickness show a linear correlation with the universal rate of about 0.2/fm.

4 pages, 3 figures

References in corpus (6)

• Pygmy dipole resonance as a constraint on the neutron skin of heavy nuclei
• Self-consistent description of multipole strength: systematic calculations
• Relativistic RPA in axial symmetry
• Decay Pattern of Pygmy States Observed in Neutron-Rich 26 Ne
• Low-energy dipole excitations in neon isotopes and N=16 isotones within the quasiparticle random phase approximation and the Gogny force
• Pygmy dipole mode in deformed neutron-rich Mg isotopes close to the drip line

Cited by in corpus (63)

• Time-dependent density-functional description of nuclear dynamics
• Symmetry energy from the nuclear collective motion: constraints from dipole, quadrupole, monopole and spin-dipole resonances
• Low-lying dipole response: isospin character and collectivity in ${}^{68}$Ni, ${}^{132}$Sn and ${}^{208}$Pb
• Information content of the low-energy electric dipole strength: correlation analysis
• Low-energy isovector and isoscalar dipole response in neutron-rich nuclei
• Glauber-model analysis of total reaction cross sections for Ne, Mg, Si, and S isotopes with Skyrme-Hartree-Fock densities
• Low-energy electric dipole response in 120Sn
• Multipole strength function of deformed superfluid nuclei made easy
• Low energy collective modes of deformed superfluid nuclei within the finite amplitude method
• Low-energy dipole strength in 112,120Sn
• Electric and magnetic dipole modes in high-resolution inelastic proton scattering at $0^{\circ }$
• Implementation of the finite amplitude method for the relativistic quasiparticle random-phase approximation
• Systematic investigation of low-lying dipole modes using the canonical-basis time-dependent Hartree-Fock-Bogoliubov theory
• Feasibility of the finite amplitude method in covariant density functional theory
• Isospin properties of electric dipole excitations in 48Ca
• Pygmy and core polarization dipole modes in ${}^{206}$Pb: connecting nuclear structure to stellar nucleosynthesis
• Finite amplitude method applied to giant dipole resonance in heavy rare-earth nuclei
• Connecting the Pygmy Dipole Resonance to the neutron skin
• Three-dimensional mesh calculations for covariant density functional theory
• Efficient calculation for the quasiparticle random-phase approximation matrix
• Pygmy and Giant Dipole Resonances by Coulomb Excitation using a Quantum Molecular Dynamics model
• Pygmy dipole resonance: collective features and symmetry energy effects
• Collective inertia of Nambu-Goldstone mode from linear response theory
• Dipole response in 208Pb within a self-consistent multiphonon approach
• Accessing the Single-Particle Structure of the Pygmy Dipole Resonance in ${}^{208}$Pb
• Energy-density-functional calculations including the proton-neutron mixing
• Low-energy E1 strength in select nuclei: Possible constraints on the neutron skins and the symmetry energy
• Finite-amplitude method for collective inertia in spontaneous fission
• Isovector and isoscalar dipole excitations in ${}^9$Be and ${}^{10}$Be studied with antisymmetrized molecular dynamics
• Shape evolution of Zr nuclei and roles of tensor force
• Low-energy dipole strength and the critical case of 48Ca
• Complex-energy approach to sum rules within nuclear density functional theory
• Structure and decay of the pygmy dipole resonance in 26Ne
• Influence of complex configurations on properties of pygmy dipole resonance in neutron-rich Ca isotopes
• Isoscalar and neutron modes in the E1 spectra of Ni isotopes and the relevance of shell effects and the continuum
• Theoretical predictions of experimental observables sensitive to the symmetry energy: Results of the SMF transport model
• Multipole modes of excitation in triaxially deformed superfluid nuclei
• Finite amplitude method on the deformed relativistic Hartree-Bogoliubov theory in continuum: The isoscalar giant monopole resonance in exotic nuclei
• Constraining slope parameter of symmetry energy from nuclear structure
• Pygmy and giant electric dipole responses of medium-heavy nuclei in a self-consistent Random Phase Approximation approach with finite-range interaction
• Fragmentation of electric dipole strength in N=82 isotones
• Mean-field analysis of ground state and low-lying electric dipole strength in ${}^{22}$C
• Experimental study of excited states of ${}^{62}$Ni via one-neutron $(d,p)$ transfer up to the neutron-separation threshold and characteristics of the pygmy dipole resonance states
• Charge-exchange dipole excitations in neutron-rich nuclei: $-1\hslash {\omega }_0$, anti-analog pygmy, and anti-analog giant resonances
• Neutron density distribution and neutron skin thickness of ${}^{208}$Pb
• On the importance of using exact pairing in the study of pygmy dipole resonance
• An implementation of nuclear time-dependent density-functional theory and its application to the nuclear isovector electric dipole resonance
• Triaxiality induced monopole-quadrupole-hexadecupole coupling in the isoscalar giant resonances for ${}^{86}\text{Ge}$
• Finite-amplitude method: An extension to the covariant density functionals
• Low-energy monopole strength in spherical and deformed nuclei : cluster and soft modes
• Nuclear structure and direct reaction studies in particle-$\gamma$ coincidence experiments at the FSU John D. Fox Superconducting Linear Accelerator Laboratory
• Finite amplitude method in linear response TDDFT calculations
• Density functional approaches to atomic nuclei
• Density functional approaches to nuclear dynamics
• Reaction mechanisms in transport theories: a test of the nuclear effective interaction
• Evaluations of uncertainties in simulations of propagation of ultrahigh-energy cosmic-ray nuclei derived from microscopic nuclear models
• Systematic investigation of E1 strength for the isotopes from Z = 28 to 50
• Dipole response in deformed halo nuclei ${}^{42}\mathrm{Mg}$ and ${}^{44}\mathrm{Mg}$
• Proton pygmy resonances: predictions for N=20 isotones
• Study of pygmy dipole resonance with a new time-dependent mean field theory
• Axially Deformed Proton-Neutron Relativistic Quasiparticle Finite Amplitude Method for Charge-Exchange Transitions
• Real-time calculations of many-body dynamics in quantum systems
• The pygmy dipole strength, the neutron radius of ${}^{208}$Pb and the symmetry energy