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Fragile Signs of Criticality in the Nuclear Multifragmentation

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arxiv nucl-th/0106018 v1 pith:6TMWOFHW submitted 2001-06-08 nucl-th

classification nucl-th
keywords multifragmentationnuclearbranchcanonicalcapacitycausedcollisionscriticality
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Deviations from an idealized equilibrium phase transition picture in nuclear multifragmentation is studied in terms of the entropic index. We investigate different heat-capacity features in the canonical quantum statistical model of nuclear multifragmentation generalized in the framework of Tsallis nonextensive thermostatistics. We find that the negative branch of heat capacity observed in quasi-peripheral Au+Au collisions is caused primarily by the non-generic nonextensivity effects.

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