n.abdallah

أ. د. نبيل نور الدين عبداللاه

استاذ - رئيس جامعة سوهاج السابق

كلية العلوم

العنوان: سوهاج -

8

إعجاب
2008 | الكلمات المفتاحية pseudorapidity,
Photon emission in Au–Au (Pb–Pb) collisions at s= 62.4 A (17.3 A) GeV
s= 17. 3A GeV are described by a geometrical model (the participant-spectator model) and a thermal model (the thermalized cylinder model) respectively. The length of the cylinder formed in relativistic nucleus-nucleus collisions at a given energy does not depend on the centrality of collision. The normalized pseudorapidity distributions of photons emitted in different types of events with different centralities at ... إقراء المزيد

2008 | الكلمات المفتاحية fragmentation,
Integral frequency distribution of projectile alpha fragments in nuclear multifragmentations at intermediate and high energies
The integral frequency distributions of the numbers of projectile alpha fragments produced in nuclear multifragmentations at intermediate and high energies are studied by a simple two-source model. The calculated results are approximately in agreement with the experimental data of 16O, 40Ar, 56Fe, 84Kr,139La, and 197Au multifragmentations in nuclear emulsions at 2.00_A_, 1.80_A_, 1.80_A_, 0.08–1.70_A_, 0.60–0.99_A_, and 0.60–0.99_A_ GeV, respectively. The ... إقراء المزيد

2006 | الكلمات المفتاحية heavy ion,
Angular distributions of target fragments in Kr-84 Em and O-16 Em collisions at high energies
A multisource ideal gas model is used to give an uniform description of the angular distributions of different kinds of target fragments produced in nucleus--nucleus collisions at high energies. The theoretical results calculated by the Monte Carlo method are qualitatively in agreement with the experimental angular distributions of target black, grey, and heavy fragments produced in 84">8484Kr-Emulsion (Em) collisions at ... إقراء المزيد

2006 | الكلمات المفتاحية (pseudo) rapidity,
Particle Production in Nucleus-Nucleus Collisions over an Energy Range from 1A GeV to 100A TeV
The overlapping cylinder model (OCM), which is used in this paper considers three components: the longitudinal and transverse movements of the source and the inverse slope parameter of the particle momentum distribution. A comparison of our model calculations in terms of (pseudo) rapidity distributions with the most recent experiments is presented. A relatively strong longitudinal movement of the source is ... إقراء المزيد

2006 | الكلمات المفتاحية black fragments,
Projected Angular Distribution and Reaction Plane Flow of Black Fragments Produced in Silicon-Emulsion Collisions at 4.5 A GeV/c
The experimental projected angular distributions of black fragments produced in siliconemulsion collisions at 4.5A GeV/c (the Dubna momentum) are reported in detail. An obvious dependence of the projected angular distribution on polar angle is observed. We introduce the reaction plane flows using the momentum components in the reaction plane. Directed reaction plane flow and elliptic reaction plane flow are observed. ... إقراء المزيد

2004 | الكلمات المفتاحية pseudo) rapidity),
Charged-particle (pseudo) rapidity distributions in e+ e−, p p¯, and A A collisions at high energies
A unified formula which describes the (pseudo) rapidity distributions of charged particles produced in high energy collisions is presented. The calculated results are compared and found to be in agreement with the experimental data of e+ e−, p p, and A A collisions at high energies. إقراء المزيد

2004 | الكلمات المفتاحية The Monte Carlo, azimuth,
Dependence of black fragment azimuthal and projected angular distributions on polar angle in silicon-emulsion collisions at 4.5 A GeV∕ c
The experimental results of dependence of black fragment azimuth (ϕ) and projected angle (ψ) distributions on polar angle θ in silicon-emulsion collisions at 4.5 A GeV∕ c (the Dubna momentum) are reported. There are two regions of enhancement around ϕ=±90 for different θ ranges. These enhancements are due to directed (v 1) and elliptic (v 2) flows. The v 1 ... إقراء المزيد

2004 | الكلمات المفتاحية black fragments, gray fragments,
Angular distributions of target fragments in magnesium-emulsion collisions at high energy
The spatial, azimuthal, and projected angular distributions of black and gray target fragments produced in magnesium-emulsion collisions at 4.5A GeV/c (the Dubna synchrophasotron momentum) are reported. A multisource ideal gas model is used to describe the experimental angular distributions. The Monte Carlo calculated results are in agreement with the experimental data. إقراء المزيد

2004 | الكلمات المفتاحية The emulsion, multiplicity,
Characteristics of black particles and forward-backward correlations in high energy nucleus-nucleus collisions
The interactions of 4.5 A GeV/c^28Si nuclei with an emulsion have been studied. The multiplicity of black particles, nb, can be utilized as a measure of the excitation energy or the temperature, T, of the residual excited nucleus, i.e. in a sample of interactions T increases with nb. The forward-backward correlations in nucleus-nucleus collisions have been investigated. إقراء المزيد

2003 | الكلمات المفتاحية participant-spectator model,
Multiplicity and Transverse Energy Distributions in Au-Au and Pb-Pb Collisions at High Energy
The multiplicity and transverse energy distributions in high-energy nucleus-nucleus collisions are described by a geometrical model, namely the participant-spectator model. The calculated results are compared and found to be in agreement with the experimental data on Au-Au collisions at the RHIC energy and Pb-Pb collisions at the SPS energy. إقراء المزيد