Deformation Parameters of Atomic Nuclei from Photoabsorption Data and Its Impact on Photoabsorption Cross Sections
DOI:
https://doi.org/10.15407/ujpe70.3.151Keywords:
photoabsorption cross-sections, axially deformed nuclei, nucleus quadrupole deformation parameters, isovector giant dipole resonance, energy splittingAbstract
The values of the effective quadrupole deformation parameter of atomic nuclei have been calculated, and their uncertainties have been estimated. The approximation of axially symmetric nuclei and the energy splitting values of two modes of the isovector giant dipole resonance (GDR) for the photoabsorption cross-sections of 144 isotopes from 6Li to 239Pu are used. For axially symmetric atomic nuclei with 155 < A < 190 and 225 < A < 250, the determined effective values of the quadrupole deformation parameter are exactly identical to the values of the quadrupole deformation parameter β. The results are compared with the values obtained in other approaches. It is demonstrated that the obtained absolute values of the quadrupole deformation parameter for the GDR excitation, as a rule, coincide, within the uncertainty limits, with the absolute values of deformations in the ground nucleus state. For the 100Mo and 178Hf nuclei, the dependences of the partial photoabsorption cross-sections on the GDR characteristics are calculated and analyzed.
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