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Theses

Bimodalité et autres signatures possibles de la transition de phase liquide-gaz de la matière nucléaire

Abstract : Nuclear matter must present a liquid-gas phase transition at intermediate energies. This thesis is a study of this transition with binary collisions of symmetrical systems Xe+Sn and Au+Au from 60 to 100 MeV/u, detected with INDRA multidetector. A possible signature of liquid-gas phase transition is the observation of a bimodal distribution for an order parameter. Bimodality is a robust signal and can differentiate two family of event : the liquid phase and the gas one. This study is made on the QP source with an asymmetry variable between the two heaviest decay products. The sorting of the event is provided by the perpendicular energy of the light charged particules emitted on the QT side. Delta-scaling and negative heat capacity are also interpreted as a possible signature of phase transition. For the first one, we observe scaling law of heaviest fragment distributions for each phase. For the second one, fluctuations of the sharing of the available energy in the system can lead to a negative branch of heat capacity which is a theorical signature of the transition. Correlation between all this observables are clearly demonstrated. A possible contribution of dynamical effect is tested and quantified with the generator of event HIPSE. The conclusion reveals a definite coherence between all signals of a phase transition.
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https://tel.archives-ouvertes.fr/tel-00007451
Contributor : Matthieu Pichon <>
Submitted on : Thursday, November 18, 2004 - 8:23:57 PM
Last modification on : Tuesday, February 5, 2019 - 12:12:08 PM
Long-term archiving on: : Tuesday, September 7, 2010 - 5:02:58 PM

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  • HAL Id : tel-00007451, version 1

Citation

M. Pichon. Bimodalité et autres signatures possibles de la transition de phase liquide-gaz de la matière nucléaire. Physique Nucléaire Théorique [nucl-th]. Université de Caen, 2004. Français. ⟨tel-00007451⟩

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