Low-energy dipole excitations towards the proton drip-line: doubly magic 48Ni

Abstract

The properties of the low-energy dipole response are investigated for the proton-rich doubly magic nucleus ${}^{48}$Ni, in a comparative study of two microscopic models: fully self-consistent Relativistic Random-Phase Approximation(RRPA) based on the novel density-dependent meson-exchange interactions, and Continuum Random-Phase Approximation(CRPA) using Skyrme-type interactions with the continuum properly included. Both models predict the existence of the low-energy soft mode, i.e. the proton pygmy dipole resonance (PDR), for which the transition densities and RPA amplitudes indicate the dynamics of loosely bound protons vibrating against the rest of the nucleons. The CRPA analysis indicates that the escape width for the proton PDR is rather large, as a result of the coupling to the continuum.

arXiv comment12 pages, 3 figures, accepted for publication in Phys. Lett. B

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• The quest for novel modes of excitation in exotic nuclei
• Large-scale calculations of supernova neutrino-induced reactions in Z=8-82 target nuclei
• Excitation spectra of exotic nuclei in a self-consistent phonon-coupling model
• Proton pygmy resonances: predictions for N=20 isotones
• Collective excitations in the Unitary Correlation Operator Method and relativistic QRPA studies of exotic nuclei