Authors: | W.F.J. Müller, J. Pochodzalla and W. Trautmann |
Published: | In GSI Nachrichten 03-95 |
Abstract: | Caloric curve of nuclei determined by the dependence of the temperature T_{HeLi} - derived from observed yield ratios of He and Li isotopes - on the excitation energy per nucleon. The rise of T_{HeLi} for excitation energies below 2 MeV per nucleon is compatible with an evaporative decay of a Fermi liquid. Beyond a total excitation energy of 10 MeV per nucleon, the steady increase of T_{HeLi} with increasing <E_{0}>/<A_{0}> with a slope of 2/3 alludes to a gas of classical, elementary particles. The plateau of the caloric curve joining the liquid-like and the gas-like regions is suggestive of a first-order phase transition with a substantial latent heat and is reminiscent of the paradigm of a phase transition, the first-order phase transition of water. However, for such a finite system, the shape of the caloric curve is also consistent with a transition in close proximity to the critical point, which is the sine qua non for the determination of critical-point properties. |
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20 pages with 14 embedded figures
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