Comparission of E1 Response of 154Sm and 155Sm in the Pygmy Dipole Resonance (PDR) Region

Yıl 2019, Cilt: 8 , 56 - 60, 31.12.2019

Hakan Yakut Emre Tabar Huseynqulu Quliyev

https://doi.org/10.17798/bitlisfen.635427

Cited By: 2

Öz

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
two-quasineutron 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.

 

Anahtar Kelimeler

TGI-QRPA, TGI-QPNM, PDR, 154Sm, 155Sm, E1

Proje Numarası

118F094

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