Discussion of the master's thesis of the student

Discussion of the master's thesis of the student " Maryam Ayad Awad"

The public discussion took place for the master’s student (Maryam Ayad Awad) Department of Physics- College of Science - University of Anbar on Sunday, August 3, 2025, in Ibn Sina Hall. for his tagged thesis

" Study of reaction cross section for some even - A samarium isotopes using exciton model"

The discussion committee consisted of:

University of Anbar - College of Sciences - President

Prof. Dr. Akram Mohammed Ali

University of Fallujah - Biotechnology Center - Member

Prof. Dr. Ahmed Hussein Ali

University of Anbar - College of Applied Sciences - Member

Assist. Prof. Dr. Ahmed Khalil Ibrahim

University of Anbar - College of Sciences - member and supervisor

Assist. Prof. Dr. Nabil Fawzi Latofi

The aim of the study is to photonuclear reaction with energies ranging from the threshold energy of 8 MeV to 22 MeV has been investigated for 144,148,150,152,154Sm isotopes using the Empire 3.2.2 code. The contributions of pre-equilibrium and compound nucleus interaction to the total giant dipole resonance cross section have been calculated using exciton and Hasher Feshbach models, respectively. It has clearly shown that the contribution of pre-equilibrium reaction is relatively small as compared to the dominant compound nucleus one, and it is significant at higher energies. The effect of different gamma strength functions on total giant dipole resonance cross section have been also studied by compared to different gamma-ray strength function formulations, namely; . Different variants of MLO model give similar trend for photoabsorption cross sections. The calculated results confirm that EGLO model cannot represented the two peak giant cross section of the deformed samarium isotopes.
The evolution of the giant dipole resonance in the transitional samarium nuclei has been studied by measure the partial photonuclear cross sections [o(y, n)+a(y, pn)] and a(y, 2n) separately and simultaneously. In this study, we construct two kinds of systematic giant dipole resonance parameters based on theoretical and experimental quadrupole deformation parameters. The results of giant dipole resonance cross section obtained by these set parameters were compared to the estimated by the Lorentzian parameters and the whole calculations are compared to experimental data. General agreements in both spectral shapes and cross sections available for nuclei under investigation are obtained, but Lorantzian parameters can obtain best reliable predictions.

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