The Proton Electric Pygmy Dipole Resonance

Abstract

The evolution of the low-lying E1 strength in proton-rich nuclei is analyzed in the framework of the self-consistent relativistic Hartree-Bogoliubov (RHB) model and the relativistic quasiparticle random-phase approximation (RQRPA). Model calculations are performed for a series of N=20 isotones and Z=18 isotopes. For nuclei close to the proton drip-line, the occurrence of pronounced dipole peaks is predicted in the low-energy region below 10 MeV excitation energy. From the analysis of the proton and neutron transition densities and the structure of the RQRPA amplitudes, it is shown that these states correspond to the proton pygmy dipole resonance.

7 pages, 4 figures, to be published in Phys. Rev. Lett

References in corpus (12)

• Relativistic Hartree-Bogoliubov model with density-dependent meson-nucleon couplings
• Microscopic HFB+QRPA predictions of dipole strength for astrophysics applications
• Large-scale QRPA calculation of E1-strength and its impact on the neutron capture cross section
• Quasiparticle random phase approximation based on the relativistic Hartree-Bogoliubov model
• Continuum Linear Response in Coordinate Space Hartree-Fock-Bogoliubov Formalism for Collective Excitations in Drip-line Nuclei
• Collectivity of the low-lying dipole strength in relativistic random phase approximation
• Dipole states in stable and unstable nuclei
• Probing the Nuclear Neutron Skin by Low-Energy Dipole Modes
• QRPA plus Phonon Coupling Model and the Photoabsorbtion Cross Section for ${}^{18,20,22}$O
• Isotopic dependence of the pygmy dipole resonance
• Pygmy dipole resonances in relativistic random phase approximation
• Dipole resonances in oxygen isotopes in time-dependent density-matrix theory

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• Feasibility of the finite amplitude method in covariant density functional theory
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• Continuum Random Phase Approximation for Relativistic Point Coupling Models
• Collective multipole excitations based on correlated realistic nucleon-nucleon interactions
• Pygmy and Giant Dipole Resonances by Coulomb Excitation using a Quantum Molecular Dynamics model
• Probing Surface Quantum Flows in Deformed Pygmy Dipole Modes
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• The quest for novel modes of excitation in exotic nuclei
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• The evolution of magnetic dipole strength in ${}^{100-140}$ Sn isotope chain and quenching of nucleon g factors
• Time-dependent Dirac equation applied to one-proton radioactive emission
• Effects of pairing correlations on the neutron skin thickness and the symmetry energy
• Electric dipole response of sd-shell nuclei within the Configuration-Interaction Shell Model approach
• Proton pygmy resonances: predictions for N=20 isotones
• New Modes of Nuclear Excitations
• Comment on "Pygmy dipole response of proton-rich argon nuclei in random-phase approximation and no-core shell model"
• Self-Consistent Description of Collective Excitations in the Unitary Correlation Operator Method
• Reply to the Comment on 'Pygmy dipole response of proton-rich argon nuclei in random-phase approximation and no-core shell model'
• Collective excitations in the Unitary Correlation Operator Method and relativistic QRPA studies of exotic nuclei