Mécanisme de production de particules sous le seuil dans la matière nucléaire froide - Production de pions neutres et de photons dans les réactions proton-noyau a 190 MeV

Abstract : The production of photons and neutral pions in the cold nuclear matter and in particular the production under the threshold, has been studied. Particles produced under the threshold in heavy ion collisions, are in fact the only sources of information on the hot nuclear matter characteristics, that is created during the collisions. The proton-nuclei reactions have been studied at 190 MeV with the TAPS collaboration, at the AGOR accelerator (KVI). The concomitant measure of photons and neutral pions allowed the cross sections determination of direct photons production, with a contribution estimation of the photons resulting from the neutral pions decay, to the measured photons spectrum. The great number of measured particles allowed to study the differential cross sections development in function of the nuclei target mass.
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Laurent Aphecetche. Mécanisme de production de particules sous le seuil dans la matière nucléaire froide - Production de pions neutres et de photons dans les réactions proton-noyau a 190 MeV. Physique Nucléaire Expérimentale [nucl-ex]. Université de Caen, 1998. Français. ⟨in2p3-00008667⟩

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