Electric dipole strength distribution below the E1 giant resonance in N = 82 nuclei

• Authors: Ekber Guliyev , Ali Kuliev , Mehmet Guner
• Languages of publication: EN

Abstracts

EN

In this study quasiparticle random-phase approximation with the translational invariant Hamiltonian using deformed mean field potential has been conducted to describe electric dipole excitations in 136Xe, 138Ba, 140Ce, 142Nd, 144Sm and 146Gd isotones. The distribution of the calculated E1 strength shows a resonance like structure at energies between 6–8 MeV exhausting up to 1% of the isovector electric dipole Energy Weighted Sum Rule and in some aspects nicely confirms the experimental data. It has been shown that the main part of E1 strength, observed below the threshold in these nuclei may be interpreted as main fragments of the Pygmy Dipole resonance. The agreement between calculated mean excitation energies as well as summed B(E1) value of the 1− excitations and the available experimental data is quite good. The calculations indicate the presence of a few prominent positive parity 1+ States in heavy N = 82 isotones in the energy interval 6–8 MeV which shows not all dipole excitations were of electric character in this energy range.

Keywords

EN

spin; parity; pygmy dipole resonance; spin flip resonance

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2010
• Volume: 8
• Issue: 6
• Pages: 961-969

Dates

published

1 - 12 - 2010

online

5 - 9 - 2010

Contributors

author

Ekber Guliyev

• Institute of Physics, Academy of Sciences, H. Cavid Avenue 33, Baku, Azerbaijan

author

Ali Kuliev

• Departments of Physics, Faculty of Science and Art, Sakarya University, Sakarya, Turkey

author

Mehmet Guner

• Departments of Mathematics, Faculty of Science and Art, Sakarya University, Sakarya, Turkey

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Identifiers

DOI

10.2478/s11534-010-0021-0