Academic literature on the topic 'Distribution angulaire (physique)'
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Dissertations / Theses on the topic "Distribution angulaire (physique)"
Bomme, Cédric. "Dynamique des processus de photoionisation d‘atomes et molécules excités en couches profondes." Paris 6, 2013. http://www.theses.fr/2013PA066014.
Full textIn this PhD thesis, we study dynamical processes induced by resonant excitation or direct ionization in deep K shell through experimental measurement realized on model systems, the argon atom and the carbonyl sulfide molecule, OCS. We developed a new experimental setup, CELIMENE dedicated to coincidence measurement of charged fragments created after interaction between free atoms/molecules and synchrotron radiation. On Argon ionized at the K shell, the ion recoil of Ar n+ due to Auger electrons emission is measured for each ionic state and is used to disentangle relaxation pathways and the radiative decay rate in one measurement. This measurement performed in coincidence with the photoelectron is then used to estimate the lifetime of the intermediate state. For the OCS molecule ionized at the S1s shell, we used molecular mass center recoil to determine the main relaxation pathways for each fragmentation channel and measurement of the PCI effect on the photoelectron allowed a determination of the lifetime of the intermediate states in a molecular system. The comparison of the experimental and theoretical MFPADs has been done for the first time in the tender x-ray region for the OCS molecule ionized above S1s threshold. Finally, measurements of the momentum of the O+ C+ S+ fragments combined with a Coulomb explosion simulation allowed us to carefully study the dynamics the molecular three body fragmentation
Münchmeyer, Moritz. "Large-scale anisotropies in the high energy cosmic ray sky." Paris 6, 2012. http://www.theses.fr/2012PA066651.
Full textChbihi, Abdelouahad. "Etude des collisions périphériques dans l'interaction 22Ne+93Nb à 30 MeV-nucléon." Lyon 1, 1987. http://www.theses.fr/1987LYO10087.
Full textIconomidou-Fayard, Lydia. "Production et étude des propriétés des bosons intermédiaires : expérience UA2." Paris 11, 1986. http://www.theses.fr/1986PA112186.
Full textWe present here some results concerning the properties of IVB’s detected by the UA2 experiment. The “electron-identification” criteria are discussed and the final samples of W’s and Z’s, corresponding to a total integrated luminosity of 863 nb⁻¹, are given. A particular study of longitudinal motion of bosons has been done and the momentum distribution of “parent-partons” has been evaluated. In the W’s center of mass frame, the angular distribution of the outgoing changed lepton (electron or positron) is in good agreement with the theoretical shape expected from the Standard Model and QCD corrections. The cross-sections of processes W→ev and Z→e⁺e⁻ and the masses of IVB’s are measured. The values of sin²0w and p are evaluated. A good agreement with standard model is observed
Boulay, Florent. "Mesure dans le 19Ne des résonances d’intérêt pour l’étude des novæ par une nouvelle méthode de diffusion inélastique." Caen, 2015. http://www.theses.fr/2015CAEN2027.
Full textNova is a thermonuclear runaway occurring in binary system of stars. The observation of the gamma rays emitted after a nova is a way to better understand this phenomenon. According to the models, the γ line at 511 keV, produced in the annihilation between positrons and electrons, would be the most intense line several hours after the explosion. One of the main positron emitters would be the 18F radioactive isotope. In order to improve the predictive power of the models, it is crucial to better determine the amount of 18F produced in the nova. Yet, the 18F destruction rate 18F(p,α)15O is given with large uncertainties. Measuring the spectroscopic properties (energy, width, spin) of states in the compound nucleus 19Ne should allow us to constrain the reaction rate. In this context, an experiment based on a new inelastic scattering method (19Ne(p,p’)19Ne*) was performed at GANIL with the VAMOS spectrometer. The detection system has been adapted to detect for the first time high energy protons (p’). A good energy resolution in inverse kinematic has been reached (σ=33 keV). The angular distribution measurement of decaying particles should provide the spin assignment of the states in a model independent way. Unfortunately, an unforeseen contamination has prevented us to complete this measurement. New spectroscopic information have been extracted and contributed to reduce the uncertainty of the 18F(p,α)15O reaction rate in a significant way. The data are compatible with a new broad state below the proton threshold (6. 41 MeV). This state seems to be sufficiently broad to contribute to the destruction reaction rate of 18F and reduces the chances for satellite detection
Moisan, Josiane. "Analyse et caractérisation des résidus lourds produits dans les réactions 129Xe+natSn entre 8 et 25 AMeV." Thesis, Université Laval, 2008. http://www.theses.ulaval.ca/2008/25664/25664.pdf.
Full textKapoor, Tejhas. "Search for new physics via the analysis of angular distributions of B_d → D* ৷ ν and B_s → φ φ decays." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP069.
Full textWe investigate the physics beyond the Standard Model by studying the angular distributions of different B meson decays. The first decay we consider is the semileptonic B_d → D* ৷ ν decay, where l is a light lepton (e or μ). The arrival of the new lattice QCD data allows us to extract new physics parameters, which was not possible with only the experimental data. Thus, we reanalyze the Belle data along with the lattice QCD data on B_d → D* form factors to simultaneously fit the form factors, Vcb and right-handed new physics coupling, whose sensitivity is found to be ~ 3-5%. In addition, by generating unbinned pseudo-dataset, we perform a sensitivity study on more general new physics models along with the lattice data. We find the right-handed and tensor new physics couplings to be constrained ~ 2-4%, while it is not so good for pseudoscalar case (~ 20-30%). The second decay we study is B_d → D* τ ν. Since τ is not detected directly in experiments, we first write a measurable angular distribution by considering the τ → μ ν ν decay. As there is no experimental data available for it, we perform a sensitivity study by generating a pseudo-dataset from fit results of B_d → D* ৷ ν (৷ = e, μ) for different new physics models. Even with lesser events than the previous light lepton case, the sensitivities are comparable. Finally, we move on to hadronic B decays, and investigate the time-dependent angular analysis of B_s → φ φ decay to search for new physics signals via CP-violating observables. Using an effective Hamiltonian containing left- and right-handed Chromomagnetic operators, we find that the hierarchy of helicity amplitudes in this model gives us a new scheme of experimental search, which is different from the one LHCb has performed in its analysis. To illustrate this new scheme, we perform a sensitivity study using two pseudo-datasets generated using LHCb's measured values and obtain sensitivity of CP-violating observables to be of the order of 5-7% with the current LHCb statistics. Moreover, we also explore the relationship between LHCb's B_s → φ φ and Belle (II)'s B_d → φ K_s results, and show that together, they can give us the chirality of new physics within our model
Al, Kalanee Tarek. "Étude du noyau d'9He par la réaction de transfert d(8He,p) à 15,4 MeV/nucléon." Caen, 2010. http://www.theses.fr/2010CAEN2058.
Full textThe study of the light neutron-rich nuclei at the limits of stability and beyond is an area of considerable interest as it affords an extreme test of our understanding of nuclear structure. Experimentally, the recent availability of radioactive beams with significant intensities and the development of new high acceptance detection systems have permitted such systems to be explored. This thesis deals with a study of the structure of the unbound N=7 system 9He via the single-neutron transfer reaction d(8He,p)9He at the SPIRAL1 facility. The principal goal of the experiment was to clarify the low-lying level structure of 9He, in particular the possible parity inversion of the ground state. The experiment was one of the first to employ the new MUST2 Si array. Owing to the relatively low statistics in the region of threshold and various backgrounds, no definitive conclusion could be drawn regarding the character of the lowest lying state. Higher lying states were identified. Comparison is made with the angular distributions derived for each of the resonances and DWBA and CRC calculations. For each of the possible spin assignments, spectroscopic factors have been estimated
Dalouzy, Jean-Christophe. "Spectroscopie du 19Ne par diffusion inélastique : Applications à l'astrophysique." Phd thesis, Université de Caen, 2008. http://tel.archives-ouvertes.fr/tel-00365695.
Full textLeong, Lou Sai. "Fission fragment angular distribution and fission cross section validation." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00924483.
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