The Proton Electric Pygmy Dipole Resonance

Details The Proton Electric Pygmy Dipole Resonance The Proton Electric Pygmy Dipole Resonance

2005-04-12

arxiv.org/abs/nucl-th/0504035v2

Phys.Rev.Lett. 94 (2005) 182501

Physics

Nuclear Physics

Nuclear Theory

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

Scientific paper

10.1103/PhysRevLett.94.182501

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.

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