Publications

Export 7 results:
Sort by: [ Author  (Desc)] Title Type Year
A B C D E F G H [I] J K L M N O P Q R S T U V W X Y Z   [Show ALL]
I
Ismail, M., M. M. Osman, E. H. Gebaly, and H. Abou-Shady, "Effect of β 6 deformation parameter on fusion cross-section and barrier distribution", Acta Physica Hungarica Series A, Heavy Ion Physics, vol. 21, issue 1, pp. 27-38, 2004. AbstractWebsite

The effect of hexacontatetrapole deformation parameter on both the fusion cross-section and the barrier distribution have been studied for U238 + O16 nuclear pair using microscopically derived heavy ion (HI) potential. A method was described to extend the calculation of HI potential between two spherical nuclei using density dependent finite range NN forces to the spherical-deformed interacting pair. Density dependent and density independent effective NN forces were used in the generalized double folding model to derive the HI potential. We found that positive β 6 has large effect on both the fusion cross-section and the barrier distribution in the presence of a small value of hexadecapole deformation parameter β 4. In this case the fusion cross-section is less sensitive to the negative value of β 6. In the presence of a large value of β 4, negative and positive β 6 values affect the fusion cross-section and have a small effect on the barrier distribution.

Ismail, M., A. Y. Ellithi, and H. Abou-Shady, "Effect of finite range of the N N force and N N cross section on reaction cross section for neutron rich nuclei", PHYSICAL REVIEW C, vol. 71, issue 2, 2005. AbstractWebsite

The reaction cross section (σR) is calculated using the optical limit of the Glauber theory. A density-dependent effective nucleon-nucleon (NN) cross section σNN is considered. Finite and zero range NN interactions are studied. The effect of finite range and an appropriate local density can increase σR up to 20% compared to the zero range at constant density (0.16fm−3), while a zero range calculation with free NN cross section increases σR up to 13%. These factors affect the values of the rms radii for neutron rich nuclei extracted from σR.

Ismail, M., W. M. Seif, A. Bakry, and H. Abou-Shady, "Study of Coulomb interaction for two diffuse spherical-deformed nuclei", Physics of Atomic Nuclei, vol. 69, issue 9, pp. 1463-1471, 2006. AbstractWebsite

The Coulomb interaction for a spherical—deformed interacting pair is derived assuming realistic nuclear charge distributions. The effect of a finite diffuseness parameter is described either by the folding product of spherical or deformed sharp-surface distribution and a spherical short-range function or by using a Fermi two-parameter distribution function. The approximate solutions obtained using these categories of charge distributions are then compared to the numerical solution obtained within the framework of the double-folding model. We found that the finite surface diffuseness parameter affects slightly the inner region of the total Coulomb potential, while it produces large errors in calculating the Coulomb form factors used frequently in nuclear reactions and fusion numerical codes.

Ismail, M., A. Y. Ellithi, and H. Abou-Shady, "EFFECT OF ISO-SPIN AVERAGING AND FINITE RANGE OF THE NN FORCE ON REACTION CROSS SECTION FOR NEUTRON RICH NUCLEI", A new era of nuclear structure physics. Proceedings of the international symposium (NENS03): IAEA - world scientific, pp. 330-331, 2004. Abstract

The optical limit to Glauber theory is used to calculate the reaction cross section, σR, for neutron rich nuclei. In-medium and iso-spin dependence of the effective nucleon-nucleon (NN) reaction cross-section, σNN, are treated correctly assuming both finite and zero range NN interaction. We find that the combined effect of iso-spin dependence and finite range of NN force can increase up to 20% for neutron rich nuclei compared to σR calculated using zero range approximation and constant matter density value 0.16 fm-3 in σNN. The maximum percentage increase is reduced to 13% compared with σR based on free NN cross section

Ismail, M., M. M. Osman, E. H. Gebaly, and H. Abou-Shady, "Orientation and deformation dependence of the reaction cross-section for a deformed target nucleus", Modern Physics Letters A, vol. 18, issue 1, pp. 57-64, 2003. AbstractWebsite

The optical limit approximation to Glauber theory was used to calculate the reaction cross-section, σR, for a deformed target nucleus. A method is presented to include both density dependence of NN reaction cross-section and higher order deformations of the target nucleus. We studied orientation, energy and deformation dependence of σR for C12–N17 and C12–U238 interacting pairs. We found that the orientation dependence of σR for the heavy target U238 depends on the value and sign of hexadecapole deformation and it is more than 2.2 times compared to the light deformed target nucleus N17. The presence of hexadecapole deformation does not affect the value of σR averaged over all orientation of the target nucleus. A geometrical model was proposed to account for the orientation dependence of σR. We found that the error in this model is less than 10%.

Ismael, E., M. M. Y. Hassan, S. Ghazal, and H. Abou-Shady, "Elastic scattering of p-4He and p-12C at intermediate energies", Egyptian Journal of Physics, vol. 30, issue 3, pp. 317-330, 1999.
Ibrahim, H. F., H. Abou-Shady, and S.M.M.Hozayen, "Design and modeling of Medical linear accelerators using the Geant4/GATE Platform", Journal of Nuclear Technology in Applied Science, vol. 5, issue 4, pp. 241-252, 2018.
Tourism