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We proceed to a critical examination of the method used in nuclear fragmentation to exhibit signals of negative heat capacity. We show that this method leads to unsatisfactory results when applied to a simple and well controlled model. These discrepancies are due to an incomplete evaluation of the internal potential energy of the fragments and to the neglect of their mutual interaction. This persists even at quite low densities.
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Campi et al. (2005) studied this question.
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