Electric dipole strength distribution below the <Emphasis Type="Italic">E</Emphasis>1 giant resonance in <Emphasis Type="Italic">N</Emphasis> = 82 nuclei |
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Authors: | Ekber Guliyev Ali Kuliev and Mehmet Guner |
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Institution: | 1.Institute of Physics,Academy of Sciences,Baku,Azerbaijan;2.Departments of Physics, Faculty of Science and Art,Sakarya University,Sakarya,Turkey;3.Departments of Mathematics, Faculty of Science and Art,Sakarya University,Sakarya,Turkey |
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Abstract: | 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. |
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Keywords: | |
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