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

Kaynakça

• 1. Goldhaber, M.,Teller, E., On nuclear dipole vibrations. Physical Review, 74, 1046, 1948
• 2. Bartholomew G. A., Annu. Rev. Nucl. Sci. 11, 259 (1961).
• 3. Brzosko J. S., Gierlik E., Soltan A., Wilhelmi Z., Can. J. Phys. 47, 2849 (1969).
• 4. Yoshida, K., and T. Nakatsukasa, Phys. Rev. C 83, 021304® (2011).
• 5. Makinaga, A., et.al., Phys. Rev. C 82, 024314 – Published 16 August 2010
• 6. Guliyev ,E., Kuliev, A. A. and Guner, M., Cent. Eur. J. Phys. 8, 961 (2010).
• 7. Kuliev, A. A, et al., Eur. Phys. J. A 43, 313 (2010).
• 8. Yakut H., et.al, 5th International Conference on Theoretical and Experimental Studies in Nuclear Applications and Technology, Conferance Proceeding Book, 167 (2019)
• 9. Bohr A. and Mottelson B., Nuclear Structure (Benjamin, Reading, 1975), Vol. II.
• 10. Raman S., et al., At. Data Nucl. Data Tables 78, 1 (2001).
• 11. Dudek J., and Werner T., J. Phys. G 4, 1543 (1978).
• 12. Soloviev G., 1976.Theory of Complex Nuclei: TerHaar D (ed). Pergamon Press. 1st edn. New York.