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Étude du caractère critique de la multifragmentation nucléaire

Abstract : From statistical mechanics, this thesis looks for a phase transition signal in nuclei . We try: to describe critical aspects of the nuclear multifragmentation. Thermodynamical observables as fragment mass/charge distributions are used in those finite systems. The percolation theory is first applied to strictly statistical events from the lattice gas model framework at the thermodynamical critical point . The scaling functions obtained are quantitatively comparable for every sample . Critical exponents are almost the same as the liquid/gas universality class ones . The second part is devoted to Fisher's model framework taking into account for the chemical potential and the surface energy coefficient. The extracted critical temperature is compatible with the percolation one . Experimental samples are then studied from peripheral (Au+Au) and central (Xe+Sn) heavy ion collisions . Entrance channel memory effects are evidenced in peripheral events. The presence of collective flow make the central ones far away from the conditions required by Fisher's model. Nevertheless, the critical energy found is indépendant of the data characteristics. This curious stability has to be studied.
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  • HAL Id : tel-03182672, version 1

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Josquin Marie. Étude du caractère critique de la multifragmentation nucléaire. Physique Nucléaire Théorique [nucl-th]. Université de Caen, 2004. Français. ⟨tel-03182672⟩

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