Journal
PHYSICS LETTERS B
Volume 647, Issue 2-3, Pages 111-117Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2007.01.056
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The relativistic random-phase approximation (RRPA) plus phonon-coupling (PC) model is applied in the analysis of E I strength distributions in Pb-208 and Sn-132, for which data on pygmy dipole resonances (PDR) have recently been reported. The covariant response theory is fully consistent: the effective nuclear interaction NL3 is used both to calculate the spectrum of single-nucleon Dirac states, and as the residual interaction which determines the collective phonon states in the relativistic RPA. It is shown that the picture of the PDR as a resonant oscillation of the neutron skin against the isospin saturated proton-neutron core, and with the corresponding RRPA state characterized by a coherent superposition of many neutron particle-hole configurations, remains essentially unchanged when particle-vibration coupling is included. The effect of two-phonon admixtures is a weak fragmentation and a small shift of PDR states to lower excitation energy. Even though the PDR calculated in the extended model space of ph circle times phonon configurations contains sizeable two-phonon admixtures, it basically retains a one-phonon character and its dynamics is not modified by the coupling to low-lying surface vibrations. (c) 2007 Elsevier B.V. All rights reserved.
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