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Negative heat capacity for hot nuclei using formulation from the microcanonical ensemble INDRA Collaboration

Abstract : By using freeze-out properties of multifragmenting hot nuclei produced in quasifusion central $^{129}\hbox {Xe}+^{nat}\hbox {Sn}$ collisions at different beam energies (32, 39, 45 and 50 AMeV) which were estimated by means of a simulation based on experimental data collected by the $4\pi $ INDRA multidetector, heat capacity in the thermal excitation energy range 4–12.5 AMeV was calculated from total kinetic energies and multiplicities at freeze-out. The microcanonical formulation was employed. Negative heat capacity which signs a first order phase transition for finite systems is observed and confirms previous results using a different method.
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https://hal.archives-ouvertes.fr/hal-02550176
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Submitted on : Wednesday, April 22, 2020 - 2:46:08 AM
Last modification on : Tuesday, June 30, 2020 - 10:21:30 PM

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B. Borderie, S. Piantelli, E. Bonnet, R. Bougault, A. Chbihi, et al.. Negative heat capacity for hot nuclei using formulation from the microcanonical ensemble INDRA Collaboration. Eur.Phys.J.A, 2020, 56 (3), pp.101. ⟨10.1140/epja/s10050-020-00109-9⟩. ⟨hal-02550176⟩

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