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arXiv · 1011.5139

Isospin Character of the Pygmy Dipole Resonance in 124Sn

J. Endres·E. Litvinova·D. Savran·P. A. Butler·M. N. Harakeh·S. Harissopulos·R. -D. Herzberg·R. Krücken·A. Lagoyannis·N. Pietralla·V. Yu. Ponomarev·L. Popescu·P. Ring·M. Scheck·K. Sonnabend·V. I. Stoica·H. J. Wörtche·A. Zilges
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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.

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J. Endres, E. Litvinova, D. Savran, P. A. Butler, M. N. Harakeh, S. Harissopulos, R. -D. Herzberg, R. Krücken, A. Lagoyannis, N. Pietralla, V. Yu. Ponomarev, L. Popescu, P. Ring, M. Scheck, K. Sonnabend, V. I. Stoica, H. J. Wörtche, A. Zilges. 2010-11-23. Isospin Character of the Pygmy Dipole Resonance in 124Sn. https://doi.org/10.1103/physrevlett.105.212503

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