http://depot.umc.edu.dz/handle/123456789/13376 2026-05-01T01:37:45Z 2026-05-01T01:37:45Z Sahnounea, Y. Kahoula, A. Kasrid, Y. Deghfele, B. Medjadic http://depot.umc.edu.dz/handle/123456789/14004 2023-01-12T16:57:22Z 2016-12-15T00:00:00Z

New calculation of L1 subshell yields fluorescence of heavy elements Sahnounea, Y.; Kahoula, A.; Kasrid, Y.; Deghfele, B.; Medjadic The analytical methods based on X-ray fluorescence have a great importance for a number of practical applications in a variety of fields including atomic physics, X-ray fluorescence surface chemical analysis, medical research and treatments (such as cancer therapy) and industrial irradiation processing. In this contribution, a summary of experimental data published in the period of time between 1955 to february-2016 was presented in a tabular form for L1 subshell fluorescence yields ( ) taken from different sources. First, a critical examination of these data using the weighted average values was presented. Then, an interpolation using the famous analytical function vs the atomic number Z was proformed to deduce a new empirical L1 subshell fluorescence yields for elements in the range 70≤Z≤96 [1-3]. At last, our calculated empirical L1 subshell fluorescence yields have been compared with other theoretical and empirical values reported in the literature.

2016-12-15T00:00:00Z Kahoula, B. Kasric, Y. Sahnounea Deghfele Khalfallaha Sampaiogand http://depot.umc.edu.dz/handle/123456789/14003 2023-01-12T16:51:59Z 2016-12-14T00:00:00Z

Relativistic K shell decay rates and fluorescence yield for Fe Kahoula, B.; Kasric, Y.; Sahnounea; Deghfele; Khalfallaha; Sampaiogand In this work, we derive the K-shell fluorescence yield using a Dirac-Fock model. To compute, radiationless and radiative transition rates we have used the MCDF code of Desclaux and Indelicato [1-3]. The wave functions were calculated in the single-configuration approach with magnetic (Gaunt) and first-order retardation terms of the Breit interaction included in the self-consistent variational method. Higher-order Breit retardation terms were added as perturbations. Regarding the QED contributions, the one-electron self-energy is evaluated using the values of Mohr and Kim [4-5] and the self-energy screening is treated with using the Welton method reported by Indelicato [1]. Vacuum polarization is included in the calculations taking the following approach: the Uelhing contribution is evaluated to all orders by being included in the self-consistent field while higher order corrections are accounted for as perturbations. The continuum electron wave function in the final state is evaluated by solving the Dirac-Fock equations with the full exchange potential and is normalized to represent one ejected electron per unit energy. The results are compared with available data from other authors.

2016-12-14T00:00:00Z Djeha, K. Si Lakhal, B. http://depot.umc.edu.dz/handle/123456789/13886 2022-12-28T04:57:55Z 2016-12-15T00:00:00Z

Inflationary models and applications Djeha, K.; Si Lakhal, B. Study the cosmic microwave background: polarization and anisotropy.The inflationary model has been proposed to address the shortcomings of the standard model of cosmology. This cosmological model offers both a solution to the horizon problem and the flatness problem. The idea of inflation states that just after the Big Bang, the observable universe has experienced a violent expansion phase that would allow it to grow a significant factor. The collected data of the European satellite Planck reinforce the scenario of inflation. Launched in 2009, the satellite analyzed for 15 months the "cosmic microwave background: CMB". The analysis focused on the CMB temperature fluctuations. The theory of inflation also provides the polarization of this radiation. The satellite Planck was designed to also measure the polarization parameter. It is proposed in this paper to study the cosmic microwave background radiation, the anisotropy of its temperature and its polarization

2016-12-15T00:00:00Z Chibane, B. I. Benrachi, F. Bali, M.S. http://depot.umc.edu.dz/handle/123456789/13885 2022-12-28T04:50:49Z 2016-12-15T00:00:00Z

Dose Evaluation in adaptive radiotherapy in head and neck cancers Chibane, B. I.; Benrachi, F.; Bali, M.S. Recent developments in radiotherapy techniques, particularly VMAT technique is a tool of choice in the treatment of tumors with complex shapes such as head and neck cancers. Patients with head and neck cancer are prone to anatomical variations and progressive changes in their tumor masses that can distance the dose distribution of the projected goals. The advent of imaging systems in radiotherapy treatment rooms, allows the realization of volumetric images on a regular basis during the irradiation sessions, allowing monitoring of individual anatomical variations in each patient during treatment The preliminary study results obtained from 3D images showed the need for replanning of treatment in patients with high tumor melting or collapse of their outer contours, due to a significant weight loss during the treatment period. The completion of this dose assessment can guide patients with head and neck cancer to adaptive radiotherapy strategy

2016-12-15T00:00:00Z