{"id":8542,"date":"2021-11-18T13:55:40","date_gmt":"2021-11-18T12:55:40","guid":{"rendered":"https:\/\/www.ummto.dz\/fs\/?p=8542"},"modified":"2021-11-23T14:04:08","modified_gmt":"2021-11-23T13:04:08","slug":"avis-de-soutenance-de-these-de-doctorat-es-sciences-en-physique-specialitesciences-nucleaires-de-m-touchrift-brahim-le-24-novembre-2021","status":"publish","type":"post","link":"https:\/\/www.ummto.dz\/fs\/avis-de-soutenance-de-these-de-doctorat-es-sciences-en-physique-specialitesciences-nucleaires-de-m-touchrift-brahim-le-24-novembre-2021\/","title":{"rendered":"Avis de Soutenance de Th\u00e8se de Doctorat Es Sciences en Physique de M.TOUCHRIFT Brahim ."},"content":{"rendered":"\n[et_pb_section fb_built=\u00a0\u00bb1″ admin_label=\u00a0\u00bbsection\u00a0\u00bb _builder_version=\u00a0\u00bb3.22″ global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_row admin_label=\u00a0\u00bbrow\u00a0\u00bb _builder_version=\u00a0\u00bb3.25″ background_size=\u00a0\u00bbinitial\u00a0\u00bb background_position=\u00a0\u00bbtop_left\u00a0\u00bb background_repeat=\u00a0\u00bbrepeat\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4″ _builder_version=\u00a0\u00bb3.25″ custom_padding=\u00a0\u00bb|||\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb custom_padding__hover=\u00a0\u00bb|||\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.13.1″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb text_orientation=\u00a0\u00bbjustified\u00a0\u00bb hover_enabled=\u00a0\u00bb0″ global_colors_info=\u00a0\u00bb{}\u00a0\u00bb sticky_enabled=\u00a0\u00bb0″]

M.TOUCHRIFT Brahim<\/span> <\/strong><\/span><\/p>\n

Soutiendra sa th\u00e8se de Doctorat en Physique Sp\u00e9cialit\u00e9:Sciences Nucl\u00e9aires.
<\/strong><\/span><\/p>\n

Intitul\u00e9e:\u00a0<\/strong>\u00ab<\/strong>\u00c9tude des m\u00e9canismes de perte d\u2019\u00e9nergie des ions mol\u00e9culaires l\u00e9gers dans les solides. <\/strong><\/span>\u00a0<\/strong>\u00bb<\/span><\/p>\n

Le\u00a0: 24 Novembre 2021<\/span><\/strong> \u00e0 <\/strong>Salle de conf\u00e9rences de la Facult\u00e9 des Sciences (4\u00e8me \u00e9tage)<\/span> \u00e0 11h00<\/span><\/strong><\/span><\/p>\n

Directrice de Th\u00e8se\u00a0: Mme SALAH Houria<\/strong><\/span><\/p>\n

Devant le jury d\u2019examen suivant<\/u><\/strong>\u00a0:<\/u><\/strong><\/span><\/p>\n\n\n\n\n\n\n\n\n
M.AOUCHICHE\u00a0\u00a0\u00a0 Hocine<\/strong><\/span><\/td>\nProfesseur<\/strong><\/span><\/td>\nUMMTO<\/strong><\/span><\/td>\nPr\u00e9sident<\/strong><\/span><\/td>\n<\/tr>\n
Mme SALAH\u00a0\u00a0\u00a0 Houria<\/strong><\/span><\/td>\nDirecteur de recherche<\/strong><\/span><\/td>\n\u00a0CRNA<\/strong><\/span><\/td>\nDirectrice de th\u00e8se <\/strong><\/span><\/td>\n<\/tr>\n
M. ZIANE\u00a0\u00a0 Abdelhamid<\/strong><\/span><\/td>\nProfesseur<\/strong><\/span><\/td>\nUMMTO<\/strong><\/span><\/td>\nCo-directeur<\/strong><\/span><\/td>\n<\/tr>\n
M. HASSANI\u00a0\u00a0\u00a0\u00a0 Saoud<\/strong><\/span><\/td>\nDirecteur de Recherche<\/strong><\/span><\/td>\nCRNA\/CPMENA<\/strong><\/span><\/td>\nExaminateur<\/strong><\/span><\/td>\n<\/tr>\n
M. KHELIFI\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Rachid<\/strong><\/span><\/td>\n\u00a0Professeur<\/strong><\/span><\/td>\nU.Saad Dahleb Blida<\/strong><\/span><\/td>\nExaminateur<\/strong><\/span><\/td>\n<\/tr>\n
Mme HAMMOUM Karima<\/strong><\/span><\/td>\nMa\u00eetre de Conf\u00e9rences(A)<\/strong><\/span><\/td>\nUMMTO<\/strong><\/span><\/td>\nExaminatrice<\/strong><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

RESUME<\/a> <\/span><\/b><\/span><\/p>\n

Cette th\u00e8se a pour objet d\u2019\u00e9tudier l\u2019\u00e9volution des processus dynamiques intervenant lors de l\u2019interaction des mol\u00e9cules diatomiques avec des cibles solides. Nous avons, en particulier, discut\u00e9 l\u2019effet d\u2019interf\u00e9rence se produisant entre les deux atomes constituant la mol\u00e9cule d\u2019hydrog\u00e8ne, et l\u2019influence de l\u2019explosion Coulombienne sur l\u2019\u00e9largissement de la perte d\u2019\u00e9nergie. Ces deux ph\u00e9nom\u00e8nes sont rencontr\u00e9s pendant le ralentissement des ions issus de la dissociation de la mol\u00e9cule H<\/span>2 <\/span>en mouvement dans le milieu, sous l\u2019effet du potentiel r\u00e9pulsif \u00e9crant\u00e9. <\/span><\/span><\/p>\n

Notre contribution \u00e0 l\u2019\u00e9valuation de la perte d\u2019\u00e9nergie de projectiles mol\u00e9culaires porte, en premier lieu, sur le calcul num\u00e9rique de la perte d\u2019\u00e9nergie des mol\u00e9cules H<\/span>2+ <\/span>dans l\u2019aluminium en utilisant la th\u00e9orie di\u00e9lectrique de Lindhard et en exploitant les \u00e9quations d\u00e9velopp\u00e9es par N. Arista et les mod\u00e8les GMR et L&S pour le confinement des \u00e9lectrons dans les solides. <\/span><\/span><\/p>\n

Sur le plan exp\u00e9rimental, nous avons \u00e9valu\u00e9 ; (i) la variation de la distance inter- atomique en fonction de l\u2019\u00e9nergie incidente et le terme d’interf\u00e9rence, (ii) d\u00e9termin\u00e9 le rapport du pouvoir d\u2019arr\u00eat mol\u00e9culaire\/atomique pour les ions H<\/span>2+ <\/span>traversant une cible solide de silicium, (iii) utilis\u00e9 la Diffusion Elastique Non Rutherford (EBS) pour la mesure de la perte d\u2019\u00e9nergie des ions H<\/span>2+ <\/span>dans l\u2019aluminium, et (iv) appliqu\u00e9 les r\u00e9sonances des r\u00e9actions C<\/span>12<\/span>(d,d<\/span>0<\/span>)C<\/span>12 <\/span>et Al<\/span>27<\/span>(p,p<\/span>0<\/span>)Al<\/span>27 <\/span>pour l\u2019observation des effets de voisinage et de l\u2019explosion Coulombienne. <\/span><\/span><\/p>\n

Pour le traitement des donn\u00e9es exp\u00e9rimentales, nous avons utilis\u00e9, pour la premi\u00e8re fois, le code DataFurnace- d\u00e9velopp\u00e9 \u00e0 l\u2019origine pour extraire les profils en profondeur \u00e0 partir des spectres de l\u2019analyse par faisceaux atomiques – pour d\u00e9terminer l\u2019accroissement de la perte d\u2019\u00e9nergie des faisceaux mol\u00e9culaires \u00e0 partir de l’analyse des spectres IBA. <\/span><\/p>\n

Les r\u00e9sultats obtenus dans ce travail ont permis d\u2019observer d\u2019une mani\u00e8re simple et efficace l\u2019effet de voisinage des ions en mouvement corr\u00e9l\u00e9 dans le silicium et l\u2019aluminium. Les valeurs obtenues pour l\u2019augmentation de la perte d\u2019\u00e9nergie et le facteur de l’\u00e9largissement de la perte d\u2019\u00e9nergie sont respectivement de 1,3 et 2, ce qui est en bon accord avec les r\u00e9sultats obtenus dans la litt\u00e9rature. <\/span><\/p>\n

Ces r\u00e9sultats ont d\u00e9montr\u00e9 l\u2019applicabilit\u00e9 de la m\u00e9thode EBS comme nouvelle approche \u00e0 l\u2019\u00e9tude des effets mol\u00e9culaires et la possibilit\u00e9 d\u2019utiliser l\u2019effet de voisinage pour d\u00e9tecter une r\u00e9sonance fine (quelques dizaines d\u2019\u00e9lectronvolts), difficile \u00e0 d\u00e9terminer exp\u00e9rimentalement. <\/span><\/p>\n

Mots cl\u00e9s :<\/strong><\/span><\/p>\n

Pouvoir d\u2019arr\u00eat, Effet de voisinage, Explosion Coulombienne, DataFurnce, Diffusion Elastique, Techniques Nucl\u00e9aires.<\/strong><\/span><\/p>\n

 <\/p>\n

ABSTRACT<\/a> <\/strong><\/span><\/p>\n

In this thesis the evolution of the dynamical processes involved in the interaction of diatomic molecules with solid targets are studied. We particularly, discussed the interference effect between the two atoms constituting the hydrogen molecule, and assessed the influence of the Coulomb explosion on the energy loss enlargement. These two phenomena are encountered during the slowing down of the ions resulting from the dissociation of the H2+ molecule traveling through a solid medium, under the effect of the screened repulsive potential.<\/span><\/p>\n

Our contribution to evaluate the molecular projectile energy loss started with the numerical calculation of the energy loss of H2+ molecules in aluminum using the Lindhard dielectric theory. To describe the solid state electron density distribution we considered the equations developed by N. Arista and the GMR and L&S models.<\/span><\/p>\n

Experimentally, we; (i) evaluated the variation of the inter-atomic distance as a function of the incident energy and the interference term, (ii) determined the molecular\/atomic stopping power ratio for H2+ ions passing through a solid silicon target, (iii) applied the Non-Rutherford Elastic Scattering to measure the energy loss of H2+ ions in aluminum, and (iv) applied the 12C(d,d0)12C and 27Al(p,p0)27Al reactions, at resonances, to reveal the occurrence of vicinage and Coulomb explosion effects.<\/span><\/p>\n

For data processing, we used for the first time, the DataFurnace code – originally developed to extract depth profiles from atomic beam analysis spectra- to determine the increase in energy loss of molecular ions with respect to atomic ones, from IBA spectra.<\/span><\/p>\n

The results obtained in this work allowed the observation of the vicinage effect of ions in a correlated motion slowing down in silicon and aluminum targets, in a simple and efficient way. The values obtained for the energy loss enhancement and energy loss broadening factor are respectively, 1.3 and 2, which are considered to be in good agreement with the results found in the literature.<\/span><\/p>\n

These results have also, demonstrated the applicability of the EBS method to study molecular effects and revealed the possibility of using the vicinage effect to detect fine resonances (a few tens of electron-volts), difficult to determine experimentally.<\/span><\/p>\n

\u00a0<\/strong><\/span>Key words:<\/span><\/strong><\/p>\n

Stopping Power, Vicinage Effect, Coulomb Explosion, DataFurnce, Elastic Scattering, Nuclear Techniques.<\/span><\/p>\n

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M.TOUCHRIFT Brahim Soutiendra sa th\u00e8se de Doctorat en Physique Sp\u00e9cialit\u00e9:Sciences Nucl\u00e9aires. Intitul\u00e9e:\u00a0\u00ab\u00c9tude des m\u00e9canismes de perte d\u2019\u00e9nergie des ions mol\u00e9culaires l\u00e9gers dans les solides. \u00a0\u00bb Le\u00a0: 24 Novembre 2021 \u00e0 Salle de conf\u00e9rences de la Facult\u00e9 des Sciences (4\u00e8me \u00e9tage) \u00e0 11h00 Directrice de Th\u00e8se\u00a0: Mme SALAH Houria Devant le jury d\u2019examen suivant\u00a0: M.AOUCHICHE\u00a0\u00a0\u00a0 Hocine […]<\/p>\n","protected":false},"author":20,"featured_media":132,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-8542","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-classe"],"yoast_head":"\nAvis de Soutenance de Th\u00e8se de Doctorat Es Sciences en Physique de M.TOUCHRIFT Brahim . - Facult\u00e9 des Sciences<\/title>\n<meta name=\"description\" content=\"Avis de Soutenance de Th\u00e8se de Doctorat Es Sciences de M.TOUCHRIFT Brahim.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ummto.dz\/fs\/avis-de-soutenance-de-these-de-doctorat-es-sciences-en-physique-specialitesciences-nucleaires-de-m-touchrift-brahim-le-24-novembre-2021\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Avis de Soutenance de Th\u00e8se de Doctorat Es Sciences en Physique de M.TOUCHRIFT Brahim . - 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