Bitlis Eren Üniversitesi Fen Bilimleri Dergisi 2147-3129 2147-3188 Bitlis Eren University 10.17798/bitlisfen.635427 Comparission of E1 Response of 154Sm and 155Sm in the Pygmy Dipole Resonance (PDR) Region https://orcid.org/0000-0002-3903-5863 Yakut Hakan Sakarya Üniversitesi https://orcid.org/0000-0002-5093-9409 Tabar Emre sakarya üniversitesi https://orcid.org/0000-0002-6306-658X Quliyev Huseynqulu sakarya üniversitesi 12 31 2019 8 56 60 10 21 2019 12 19 2019 Copyright © 2012, Bitlis Eren Üniversitesi Fen Bilimleri Dergisi 2012 Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

The dipole response associated with the pygmy dipoleresonance (PDR) in 154Sm and 155Sm has been studied. Inthe 154Sm nucleus 1- phonons with K=0 and K=1 branches havebeen calculated using the Translation and Galilean Invariant QuasiparticleRandom Phase Approximation (TGI-QRPA). The structure of the more pronouncedelectric dipole (E1) peaks in PDRregion in 154Sm is composed of predominantly two-quasiproton ortwo-quasineutron states. The calculations in 155Sm has beenperformed in the framework of the Translation and Galilean Invariant QuasiparticlePhonon Nuclear Model (TGI-QPNM) based on theTGI-QRPA 1- phonons calculated for 154Sm. When going from154Sm 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 inthe PDR region in 155Sm. Even though the strong fragmentation of theE1 strength obtained for 155Sm,in 5-8 MeV energy region the summed E1strength is comparable to that in 154Sm. The results indicate thatone quasiparticle behaves solely as a spectator in 155Sm.

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