Published in
American Physical Society, Physical Review Letters, 21(105)
DOI: 10.1103/physrevlett.105.212503
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Isospin Character of the Pygmy Dipole Resonance inSn124
,
P. A. Butler ,
M. N. Harakeh ,
S. Harissopulos,
R.-D. Herzberg,
R. Krücken,
A. Lagoyannis,
N. Pietralla,
V. Y.-U. Ponomarev,
L. Popescu,
P. Ring,
M. Scheck,
K. Sonnabend
and other authors.
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Abstract
The pygmy dipole resonance has been studied in the proton-magic nucleus 124Sn with the (α, α'γ) coincidence method at Eα=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 (α, α'γ) as well as in (γ, γ') reactions and a group of states at higher energies which is only excited in (γ, γ') 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.