Population of dipole states via isoscalar probes: the splitting of pygmy dipole resonance in ${}^{124}$Sn}

Abstract

Inelastic $\alpha$-scattering excitation cross sections are calculated for electric dipole excitations in ${}^{124}$Sn based on the transition densities obtained from the relativistic quasiparticle time-blocking approximation (RQTBA) in the framework of a semiclassical model. The calculation provides the missing link to directly compare the results from the microscopic RQTBA calculations to recent experimental data measured via the $(\alpha ,{\alpha }^{\prime }\gamma )$ reaction, which show a structural splitting of the low-lying E1 strength often denoted as pygmy dipole resonance (PDR). The experimentally observed splitting is reproduced by the cross section calculations, which allows to draw conclusion on the structure of the PDR.

6 pages, 7 figures; accepted in Phys. Rev C as Rapid Communication

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Cited by in corpus (6)

• Low-energy electric dipole response in 120Sn
• Low-energy dipole strength in 112,120Sn
• Nuclear response theory with multiphonon coupling in a covariant framework
• Accessing the Single-Particle Structure of the Pygmy Dipole Resonance in ${}^{208}$Pb
• Nature of low-lying electric dipole resonance excitations in 74Ge
• An overview of the scientific contribution of Andrea Vitturi to Nuclear Physics (being an account of the recent TNP19 meeting held in Padova)