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• W2419466476 abstract "Background: In atomic nuclei, a concentration of electric dipole strength around the particle threshold, commonly denoted as pygmy dipole resonance, may have a significant impact on nuclear structure properties and astrophysical scenarios. A clear identification of these states and the structure of this resonance is still under discussion.Purpose: We present an experimental and theoretical study of the isospin character of the pygmy dipole resonance and investigation of a splitting of the electric dipole strength previously observed in experiments on $N=82$ nuclei.Method: The pygmy dipole resonance has been studied in the semi-magic $Z=50$ nucleus ${}^{124}$Sn by means of the $(ensuremath{alpha},{ensuremath{alpha}}^{ensuremath{'}}ensuremath{gamma})$ coincidence method at ${E}_{ensuremath{alpha}}=136phantom{rule{0.28em}{0ex}}mathrm{MeV}$ using the Big-Bite Spectrometer at the Kernfysisch Versneller Instituut in Groningen, The Netherlands.Results: A splitting of the low-energy part of the electric dipole strength was identified in ${}^{124}$Sn by comparing the differential cross sections measured in $(ensuremath{alpha},{ensuremath{alpha}}^{ensuremath{'}}ensuremath{gamma})$ to results stemming from $(ensuremath{gamma},{ensuremath{gamma}}^{ensuremath{'}})$ photon-scattering experiments. While an energetically lower-lying group of states is observed in both kinds of experiments, a higher-lying group of states is only excited in the $(ensuremath{gamma},{ensuremath{gamma}}^{ensuremath{'}})$ reaction. In addition, theoretical calculations using the self-consistent relativistic quasiparticle time-blocking approximation and the quasiparticle-phonon model have been performed. Both calculations show a qualitative agreement with the experimental data and predict a low-lying isoscalar component that is dominated by neutron-skin oscillations as expected for the pygmy dipole resonance. Furthermore, the states at higher energies show a pronounced isovector component and a different radial dependence of the corresponding transition densities as expected for the tail of the giant dipole resonance.Conclusions: An experimental signature of the neutron-skin oscillation of the pygmy dipole resonance has been corroborated. The combination of the presented reactions might make it possible to identify states of this resonance." @default.
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• W2419466476 date "2012-06-28" @default.
• W2419466476 modified "2023-10-01" @default.
• W2419466476 title "Structure of the pygmy dipole resonance in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msup><mml:mrow /><mml:mn>124</mml:mn></mml:msup></mml:math>Sn" @default.
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• W2419466476 doi "https://doi.org/10.1103/physrevc.85.064331" @default.
• W2419466476 hasPublicationYear "2012" @default.
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