Isospin Character of the Pygmy Dipole Resonance in 124Sn

Details Isospin Character of the Pygmy Dipole Resonance in 124Sn Isospin Character of the Pygmy Dipole Resonance in 124Sn

2010-11-23

arxiv.org/abs/1011.5139v1

Phys.Rev.Lett.105:212503,2010

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

10.1103/PhysRevLett.105.212503

The pygmy dipole resonance has been studied in the proton-magic nucleus 124Sn with the (a,a'g) coincidence method at E=136 MeV. The comparison with results of photon-scattering experiments reveals a splitting into two components with different structure: one group of states which is excited in (a,a'g) as well as in (g,g') reactions and a group of states at higher energies which is only excited in (g,g') reactions. Calculations with the self-consistent relativistic quasiparticle time-blocking approximation and the quasiparticle phonon model are in qualitative agreement with the experimental results and predict a low-lying isoscalar component dominated by neutron-skin oscillations and a higher-lying more isovector component on the tail of the giant dipole resonance.

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