Department
Departement of Physics
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Recent Publications
New semi empirical formula o(n,t) cross section
reaction at 14.6 MeV. This semi-empirical systematic contains free parameters fixed by experimental
data, we use pre-equilibrium exciton model to describe tritium emission in nuclear reactions induced
with rapid neutrons. To verify the quality of the proposed formula, we compare the obtained cross-
section with measured ones. We found that calculated (n, t) excitation function is close to the
experimental data and the proposed systematic better describes tritium emission for even-even nuclei
target.
Citation
M. NEHAOUA Samra, (2024-12-16), "New semi empirical formula o(n,t) cross section", [international] ICRAMPCS2024 , Algérie
NEW SEMI EMPIRICAL SYSTEMATIC OF (N, T) REACTION CROSS SECTION
nuclear reaction at 14.6 MeV. This semi-empirical systematic contains free
parameters fixed by experimental data, we use pre-equilibrium exciton model to
describe tritium emission in nuclear reactions induced with rapid neutrons. To
verify the quality of the proposed formula, we compare the obtained cross-section
with measured ones. We found that calculated (n, t) excitation function is close to
the experimental data and the proposed systematic better describes tritium
emission for even-even nuclei target.
Citation
M. NEHAOUA Samra, (2024-11-23), "NEW SEMI EMPIRICAL SYSTEMATIC OF (N, T) REACTION CROSS SECTION", [international] NUPPAC'24 , Egypt
Isotopic effects in the He+ - He collision at lower energies
their gases such as He+(2s)− He(1s), when both species are in their ground states, are either
gerade (g) or ungerade (u), namely, 2Σ+ g or 2Σ+ u in the field of energy 10−12 ≤ E ≤ 10−2 (
a.u.), using new and modern data. Elastic cross-sections have also been calculated and the
isotope effect of the presence of 4He and 3He atoms has been addressed, taking into account
the nuclear spin and analog effect emanating from similar and non-distinction between
colliding atoms.
Citation
M. NEHAOUA Samra, fouzia bouchelaghem
THEORICAL FORMULAE OF (n, 3 He) REACTION FUNCTION EXCITATION AT 14?6 MeV
excitation at 14.6 MeV, this semi-empirical systematic reduces parameters taken in previous
proposed formulae which increase the contribution of pre-equilibrium 3 He particle emission. We
use exciton model in closed form and coalescence model to describe the pre-equilibrium 3 He
particle emission in reaction induced by neutron. To check the formula’s quality we compare
obtained cross section with measured ones. The formula obtained in this work has a good fitting
with lower values of statistical parameters.
Citation
M. NEHAOUA Samra, (2024-09-24), "THEORICAL FORMULAE OF (n, 3 He) REACTION FUNCTION EXCITATION AT 14?6 MeV", [international] NUPPAC'24 , Egypt
Thermophysical properties of helium and argon gas.
diffusion, viscosity, and thermal conductivity in a thermal field between 1K and 10000K, by the
Chapman-Enskog model. The calculations, essentially quantal, are based on interatomic potential
constructed from new and recent potential data points.
Citation
M. NEHAOUA Samra, (2024-09-23), "Thermophysical properties of helium and argon gas.", [international] NUPPAC24 , Egypt
The second virial coefficient of Ar2
Citation
M. NEHAOUA Samra, (2024-06-26), "The second virial coefficient of Ar2", [national] CAPS-2024 , Khemis-Miliana, Algeria
Transport properties of argon atoms diffusing in their parent gas.
Citation
M. NEHAOUA Samra, (2023), "Transport properties of argon atoms diffusing in their parent gas.", [national] National Seminar of Physics, Chemistry, and Their Applications Webinar (NSPCA'23) , Bordj Bou arriridj
physique statistique
année de physique théorique étudie les systèmes à l’équilibre thermodynamique qui gardant
ses grandeurs macroscopiques constantes. On introduit ce manuscrit par un rappel en
probabilités et statistiques, ainsi un rappel de thermodynamique. Ce manuscrit se subdivise
principalement en cinq chapitres, le premier chapitre définit les systèmes à l’équilibre et ses
macro-états et micro-états possibles, les trois chapitres restants sont portés sur les différents
ensembles : microcanonique, canonique et grand-canonique, dans le cinquième quatrième
chapitre on présente une introduction en statistique quantique, des exercices sont proposés à la
fin des chapitres.
Citation
M. NEHAOUA Samra, (2020), "physique statistique", [national] Mohamed Boudiaf University
Semi-empirical systematic of (n, 3He) reaction cross section at 14, 6 MeV
Citation
M. NEHAOUA Samra, (2020), "Semi-empirical systematic of (n, 3He) reaction cross section at 14, 6 MeV", [national] Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms , North-Holland
Neutronic parameters calculations using MCNP code
Citation
M. NEHAOUA Samra, (2018), "Neutronic parameters calculations using MCNP code", [national] 1 St Meeting on Monte Carlo Simulations in Radiation Physics- October, (MMSRP_2018) 31 st 2018. , SETIF
IONISATION D’ATOMES ET DE MOLECULES PAR IMPACT D’ELECTRONS : CONTRIBUTION DE L’ORTHOGONALISATION ET DES EFFETS DE DISTORSION
moléculaires a été effectuée à l’aide de l’approximation de Born au premier ordre.
Dans ce cadre, l’électron incident (puis diffusé) est décrit par une onde plane alors que
l’électron éjecté sera successivement décrit par une onde coulombienne, puis par une onde
distordue. Dans une première partie le calcul des sections efficaces différentielles et totales a
été réalisé en prenant un état final orthogonalisé à l’état initial de la cible. Un accord
globalement satisfaisant a été trouvé avec les mesures expérimentales réalisées sur le néon,
l’eau, le méthane et l’ammoniac pour les sections efficaces totales. Dans une deuxième partie
la distorsion de la trajectoire de l’électron éjecté a été prise en compte dans le calcul des
sections efficaces différentielles. Un meilleur accord est trouvé dans le cas de l’ionisation de
couches internes de gaz rares (argon par exemple) pour la localisation du pic binaire mais des
désaccords subsistent pour la description du pic de recul.
Citation
M. NEHAOUA Samra, (2016), "IONISATION D’ATOMES ET DE MOLECULES PAR IMPACT D’ELECTRONS : CONTRIBUTION DE L’ORTHOGONALISATION ET DES EFFETS DE DISTORSION", [national] Ferhat Abbas university
Effect of orthogonalization on total ionization cross sections by electron impact: application to small molecules
molecules by using an improved first Born approximation which has been previously applied for atomic
targets by Bartlett and Stelbovics [P.L. Bartlett, A.T. Stelbovics, Phys. Rev. A 66, 012707 (2002)]. In
this model a full orthogonalization of the final state to the initial state has been performed to evaluate
the cross sections. One center wave functions are employed to describe the molecular orbitals. It is shown
that the results obtained in the present model are immensely improved when compared with the first Born
model without orthogonalization. Furthermore, an overall agreement is also observed when a comparison
is made with the experimental data.
Citation
M. NEHAOUA Samra, Salim Houamer, Claude Dal Cappello, Mehdi Chinoune, Alexander Galstyan, Amulya Chandra Roy, , (2015-03-24), "Effect of orthogonalization on total ionization cross sections by electron impact: application to small molecules", [national] The European Physical Journal d , Springer Science+Business Media, EDP Sciences, Società Italiana di Fisica
Ionization of thymine by electron impact
problem when we want to treat it by an ab-initio quantum model. The difficulty is
due to the multicenter character of the target wave function. One way to avoid this
difficulty is to use a single center wave function for the initial (or excited) state of the
molecule.
Citation
M. NEHAOUA Samra, (2013), "Ionization of thymine by electron impact", [international] 11th european conference on atoms, molecules and photons (ecamp11) june 2013. , France
Partitioning and transmutation of 99Tc in fission reactors and hybrids systems
Citation
M. NEHAOUA Samra, (2005), "Partitioning and transmutation of 99Tc in fission reactors and hybrids systems", [international] Proceedings of the Fifth Nuclear and Particle Physics (NUPPAC) 2005. , Egypte