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Literatura académica sobre el tema "Structure nucléaire théorique"
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Artículos de revistas sobre el tema "Structure nucléaire théorique"
Johnson, Genevieve Fuji. "The Limits of Deliberative Democracy and Empowerment: Elite Motivation in Three Canadian Cases". Canadian Journal of Political Science 44, n.º 1 (marzo de 2011): 137–59. http://dx.doi.org/10.1017/s0008423910001058.
Texto completoDesveaux, Emmanuel. "Parenté". Anthropen, 2019. http://dx.doi.org/10.17184/eac.anthropen.102.
Texto completoCortado, Thomas Jacques. "Maison". Anthropen, 2020. http://dx.doi.org/10.17184/eac.anthropen.131.
Texto completoCalame, Claude. "Individu". Anthropen, 2016. http://dx.doi.org/10.17184/eac.anthropen.015.
Texto completoTesis sobre el tema "Structure nucléaire théorique"
Gratchev, Ivan. "Étude expérimentale et théorique de la structure nucléaire des isotopes de sélénium riches en neutrons". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI078/document.
Texto completoThe present thesis manuscript includes the nuclear spectroscopy studies of 84−88Se. A more favourable fission reaction for their study is 235U(nth, f). The measurement was performed at the PF1B cold-neutron beam facility of the Institut Laue-Langevin (ILL), Grenoble. The fission reaction has been used in conjunction with the EXILL Ge array to study excited states in the neutron-rich Se nuclei. Thanks to this spectroscopic study, a first level scheme of 88Se was established and new excited states were assigned to other selenium isotopes. Furthermore, the angular correlation studies were carried out to confirm the spin assignment of the first excited states in the 84-88Se nuclei. The theoretical calculations using the shell model (SM), the algebraic collective model (ACM) and the quasiparticle plus phonon model (QPM) were performed in order to interpret the nuclear structure and the shape of the nucleus of interest 88Se. According to these models, the nucleus 88Se is γ-unstable and can be interpreted as a transitional nucleus. The shell-model calculations using a 78Ni core and the ACM calculations reproduce the decay scheme of 88Se well. The QPM calculations show that the collectivity of second state 2+2 of 88Se is weak and that this state contains a strong quasiparticle component
Leprince, A. "Etude de la structure au-delà de la stabilité via la cassure du 15B". Phd thesis, Université de Caen, 2009. http://tel.archives-ouvertes.fr/tel-00451526.
Texto completoSirockin, Finton. "Intégration de la modélisation moléculaire et de la résonance magnétique nucléaire dans la conception rationnelle de ligands". Université Louis Pasteur (Strasbourg) (1971-2008), 2003. http://www.theses.fr/2003STR13137.
Texto completoDesigning ligands that bind with high affnity to biological macromolecules' key regions in order to modify their activity is a key process in the design of pharmaceutical molecules. Structure-based ligand design combines structural information regarding the biological target and intermolecular interactions' physical principles. Structural genomics is aimed at fast structure determination of a large number of proteins, and consequently, a great number of protential therapeutic targets. Structure-based ligand design approaches will be of great help in this perspective. Rational ligand design and biological macromolecules' structure determination are two aspects studied in this thesis. The work presented here consists in the inclusion of solvation effects in the ranking of the molecular fragments' binding modes identified by the program MCSS. Taking the solvation into account led to a realistic ranking of the binding modes that has been validated by a NMR study performed independently at Sanofi-Synthélabo. An original clustering algorithm based on the van der Waals interactions between the fragments and the target has been developped and the whole procedure has been automatized and can be distributed on several comuters with one or more processors across a network. The method's robustness was successfully tested on an aminoglycoside/RNA complex. The NMR aspect of this work is approached through the theoretical study of the effect of disulfide bridges on proton chemical shift by quantum calculations in order to define somple equations that model the physical contributions influencing proton chemical shift. In a last part, the two axis developped here are used in the framework of an antibiotics/RNA complex to study the possible use of experimental chemical shift data to filter the binding modes identified by MCSS
Lasseri, Raphaël-David. "Distribution spatiale de fermions fortement corrélés en interaction forte : formalisme, méthodes et phénoménologie en structure nucléaire". Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS248/document.
Texto completoThe atomic nucleus is intrinsically a complex system, composed of strongly correlated non-elementary fermions, sensitive to strong and electroweak interaction. The description of its internal structure is a major challenge of modern physics. In fact the complexity of the nucleon-nucleon interaction generates correlations which are responsible of the diversity of shapes that the nuclei can adopt. Indeed the nuclei can adopt either quasi-homogeneous shapes when nucleons are delocalized or shapes where spatially localized structure can emerge, namely nuclear clusters. This work is an extension of relativistic mean-fields approach (RMF), which allows an universal treatment of nuclear phenomenology. In a first time we will present the necessary formalism to construct such an approach starting with the fundamental interactions underlying nucleons dynamics within the nucleus. However this approach doesn't allow an accurate reproduction of experimental properties: a purely mean-field approach neglects to many correlations. Existing methods to treat both particle-hole (deformation), particle-particle (pairing) correlations will be discussed. First we will propose a new diagrammatic method, which take correlation into account in a perturbative way, the implementation of this approach using combinatory theory will be discussed. Then we will get back to a phenomenological treatment of particle-hole correlations, to focus on the impact of particle-particle. Formation of nucleonic pair will be discussed in the language of graph theory, allowing several formal simplifications and shed a different light on pairing. Pairing correlations will be at first treated using a relativistic Hartree-Bogolioubov approach. Nevertheless this formalism doesn't conserve particle number, and thus we will present a projective approach to restore it. The effect of this restoration will also be studied. Then to describe general nuclear deformation, several implementations and optimizations developed during this PhD will be presented. With this tools, clusterisation will be investigated as phenomenon emerging for certain class of correlations. Localization measure will be derived allowing a clearer understanding of cluster physics. The analysis of theses quantities makes possible a first unified description of cluster formation both for light nuclei (Neon) or for heavy alpha emitters (Polonium). Cluster emergence will be described as a quantum phase transition, an order parameter will be displayed and this formation will be characterized as a Mott transition. The influence of pairing correlations on cluster formation is studied and a detailed study of pairs spatial properties is performed for nuclei from several mass regions. Lastly a method allowing treatment of 4-body correlations (quartteting) is proposed to explain cluster emergence as alpha particle preformation
Achouri, N. L. "Etude de la radioactivité de $^{22}$Al et spectroscopie par diffusion élastique résonante". Phd thesis, Université de Caen, 2001. http://tel.archives-ouvertes.fr/tel-00168474.
Texto completoLa première partie est consacrée à l'étude de la décroissance Β- particules retardées de 22Al. L'expérience décrite dans cette partie a été réalisée au GANIL sur la ligne LISE3 et a permis de mesurer avec une meilleure précision par rapport aux expériences précédentes, l'énergie des transitions Β-p, Β-2p et Β-Α et leurs rapports d'embranchement ainsi que le temps de vie de 22Al. Pour la première fois les coïncidences entre les particules chargées et les rayonnements Γ ont été mesurées permettant de reconstituer le schéma de décroissance de ce noyau. La comparaison entre les résultats expérimentaux, les calculs de modèle en couches effectués avec le code OXBASH et le noyau miroir 22F a permis de déterminer le spin, la parité et la masse de l'état fondamental de 22Al ainsi que de nouveaux niveaux dans 22Mg. La force de Gamow-Teller déterminée expérimentalement et celle calculée par le modèle en couches en utilisant un opérateur effectif sont en parfait accord à basse énergie d'excitation.
La deuxième partie est consacrée à l'étude de la méthode de la diffusion élastique en cinématique inverse comme outil pour la spectroscopie de noyaux exotiques. Plusieurs simulations ont été réalisées afin d'étudier la faisabilité d'une telle expérience et d'optimiser les paramètres expérimentaux pour obtenir la meilleure résolution en énergie. Des expériences réalisées au GANIL avec des faisceaux stables puis avec un faisceau radioactif ont montré que cette méthode est un outil puissant pour la spectroscopie des noyaux exotiques avec un faisceau radioactif dont les propriétés sont équivalentes à celles des faisceaux prochainement délivrés par SPIRAL.
Ayouz, Mehdi Adrien. "Étude théorique de la dynamique de systèmes quantiques à petit nombre de corps : structure et dynamique de formation de la molécule H3¯ dans l'espace". Paris 11, 2010. http://www.theses.fr/2010PA112361.
Texto completoThe H3¯ molecule, considered as the simplest negative triatomic molecular ion, is a benchmark system because it allows testing theoretical and numerical methods due to its weak particle mass, prior to be applied to heavier species. To study this molecule and describe its dynamics, we have determined the ground potential energy and permanent dipole moment surfaces. Using the potential energy surface we established the structure of this molecule and its isotopologues. We have developed a theory of radiative association (RA) of H2 + H¯ → H3¯ + hbar ω which could occur in cold and dense interstellar medium (ISM). The obtained permanent dipole moment surface allows us to calculate the formation rate of this molecule in this medium. It appears that the formation is possible for H¯ and para H2 collisions. An eventual observation of H3¯ would be a proof for the presence of H¯ in the interstellar medium. This ion is known to play a role in ISM chemistry especially in the formation process of negative ions. Finally a methodological and numerical developments have been also carried out in order to describe the dynamics of H3¯ in collectives coordinates and compute cross sections for exchange nuclei in its isotopologues
Roux, Antoine. "Emulation of PGCM calculations using the Eigenvector continuation method". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP114.
Texto completoAn atomic nucleus is a quantum system of interacting nucleons and constitutes a problem difficult to solve exactly. For this reason, a diversity of approximate resolution methods has been designed, and Projected Generator Coordinate Method (PGCM) is one of them. The strong point of PGCM is to construct a physically inspired small dimensional space, in which an approximate solution of the nuclear many-body problem is easily found. However the numerical cost of PGCM space computation make this method inadapted for sensibility analysis of nuclear observables with restect to parametrisation of the interaction model, this analysis requiring an huge number of PGCM computations. In order to make this type of study possible, this thesis explore the concept of PGCM emulator. In this work, a combination of PGCM with Eigenvector Continuation (EC) is constructed and studied. This combination (the PGCM-EC emulator) takes advantage of mathematical similarities between PGCM and EC, and above all of the decomposition of the hamiltonian as a linear combination of parameter-independent terms. The latter property is used to concentrate the heavier numerical cost in the computation of parameter-independent quantities (the elementary kernels), and open the feasability of massive PGCM emulations, the price being having first-handedly computed the costly elementary kernels. Limits of the emulator are also explored, by introducing the concept of over-training, which is exactly a consequence of the aproximativeness of a PGCM computation. Eventually this thesis demonstrates the possibility to emulate millions of PGCM computations with an error on collective spectroscopy less than 3%, and with a low numerical cost fraction of 1% of the million PGCM calculations cost
Bonnard, J. "Approches Monte-Carlo quantiques à chemins contraints pour le modèle en couches nucléaire". Phd thesis, Université de Caen, 2012. http://tel.archives-ouvertes.fr/tel-00803317.
Texto completoEl, Feddi Mustapha. "Homogénéisation des équations de Maxwell dans les structures périodiques, rôle de la fréquence dans la loi de comportement". Paris 11, 1996. http://www.theses.fr/1996PA112360.
Texto completoWe present in this work a novel approach of homogenisation technique for Maxwell equations in periodic structures. The solution is supposed to be a sum of a macroscopic field (or a field with slow variations), and a microscopic field (or a perturbation field with high spatial frequency). We obtain a specific Maxwell problem in the basic cell, called the cell-problem whose solution, by a finite element method, allows to find the constitutive law of equivalent media. A study of cell-problem leads to three different situations of homogenisation: the static one, the dynamic one and the high frequency one. The situation of static case corresponds to the constitutive law given by classic homogenisation techniques, the dynamic situation provides a constitutive law depending on frequency, and the situation of high frequency leads to an appropriate behaviour. Ln some cases, the equivalent media is chiral: we see "cross-dependencies", the magnetic induction B depends not only on magnetic field H but on electric field E as well, and the electric induction D depends both on E and H, even with non-chiral components
Bastin, B. "Étude de la structure des noyaux riches en neutrons autour de la fermeture de couches N=28 par spectroscopie gamma en ligne". Phd thesis, Université de Caen, 2007. http://tel.archives-ouvertes.fr/tel-00269886.
Texto completoLibros sobre el tema "Structure nucléaire théorique"
G, Roberts R. The structure of the proton: Deep inelastic scattering. Cambridge [England]: Cambridge University Press, 1990.
Buscar texto completoNATO Advanced Research Workshop and International Symposium on the Physicsand Chemistry of Small Clusters (1986 Richmond, Va.). Physics and chemistry of small clusters. Plenum in cooperation with NATO Scientific Affairs Division, 1987.
Buscar texto completoKrasnoholovets, Volodymyr. Structure of Space and the Submicroscopic Deterministic Concept of Physics. Taylor & Francis Group, 2021.
Buscar texto completoStructure of Space and the Submicroscopic Deterministic Concept of Physics. Taylor & Francis Group, 2017.
Buscar texto completoG, Roberts R. Structure of the Proton: Deep Inelastic Scattering. Cambridge University Press, 2012.
Buscar texto completoFundamentals of Picoscience. Taylor & Francis Group, 2013.
Buscar texto completoSattler, Klaus D. Fundamentals of Picoscience. Taylor & Francis Group, 2013.
Buscar texto completoSattler, Klaus D. Fundamentals of Picoscience. Taylor & Francis Group, 2013.
Buscar texto completoSattler, Klaus D. Fundamentals of Picoscience. Taylor & Francis Group, 2020.
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