Comparission of E1 Response of 154Sm and 155Sm in the Pygmy Dipole Resonance (PDR) Region
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Date
2019Author
YAKUT, Hakan
TABAR, Emre
QULIYEV, Huseynqulu
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The dipole response associated with the pygmy dipole resonance (PDR) in 154Sm and 155Sm has been studied. In the 154Sm nucleus 1- phonons with K=0 and K=1 branches have been calculated using the Translation and Galilean Invariant Quasiparticle Random Phase Approximation (TGI-QRPA). The structure of the more pronounced electric dipole (E1) peaks in PDR region in 154Sm is composed of predominantly two-quasiproton or twoquasineutron states. The calculations in 155Sm has been performed in the framework of the Translation and Galilean Invariant Quasiparticle Phonon Nuclear Model (TGI-QPNM) based on the TGI-QRPA 1- phonons calculated for 154Sm. When going from 154Sm to neighbouring 155Sm, the fragmentation of the E1 strength is dramatically enhanced. The results emphasize the role of the quasiparticle⨂phonon interactions in enhancing the fragmentation of the strength in the PDR region in 155Sm. Even though the strong fragmentation of the E1 strength obtained for 155Sm, in 5-8 MeV energy region the summed E1 strength is comparable to that in 154Sm. The results indicate that one quasiparticle behaves solely as a spectator in 155Sm.
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