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Étude des corrélations entre particules légères dans la réaction $^{16}$O+$^{197}$Au à 94 Mev/u

Abstract : Heavy ions collisions produce particles sources for which it is possible to determine the spatial and temporal extent by constructing the correlation functions of the emitted particles pairs. The first part of this work composed of four parts, describes the theoretical models required for the extraction of the size and lifetime of the source. The second part presents the set-up of the 16O + 197Au at 94 MeV/u experiment. The set-up was constituted by a correlator to measure correlation functions and by a 2 π multidetector to detect light charged particles. We show the experimental technics we have used for the correction from the background coincidences in a multidetector, the experimental correlation functions determination and also, the speed spectra construction for particles which are detected in the multidetector. The third part exhibits our experimental results and shows that the multidetector allows to select different physical events classes according to which we can study the evolution of the sources sizes. The fourth part is a discussion about results coming from the previous part. On the one hand we show that the light charged particles multiplicity between 30"0 and 90"0 is a good filter for the violence of the collision and on the other hand, remarks are made on the validity of the theoretical models. We propose also a different construction technics for the correlation functions. The necessity to calculate correlation functions by considering the statistical model is also mentioned
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Alain Ferragut. Étude des corrélations entre particules légères dans la réaction $^{16}$O+$^{197}$Au à 94 Mev/u. Physique Nucléaire Expérimentale [nucl-ex]. Université de Caen (France), 1990. Français. ⟨tel-02068007⟩



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