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Isospin Character of the Pygmy Dipole Resonance in 124Sn
- Source :
- Phys.Rev.Lett.105:212503,2010
- Publication Year :
- 2010
-
Abstract
- 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.
- Subjects :
- Nuclear Experiment
Nuclear Theory
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys.Rev.Lett.105:212503,2010
- Publication Type :
- Report
- Accession number :
- edsarx.1011.5139
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.105.212503