ar X iv : n uc l - th / 9 90 10 16 v 1 8 J an 1 99 9 Experimental and Theoretical Search for a Phase Transition in Nuclear Fragmentation

نویسنده

  • S. Salou
چکیده

Phase transitions of small isolated systems are signaled by the shape of the caloric equation of state e∗(T ), the relationship between the excitation energy per nucleon e∗ and temperature. In this work we compare the experimentally deduced e∗(T ) to the theoretical predictions. The experimentally accessible temperature was extracted from evaporation spectra from incomplete fusion reactions leading to residue nuclei. The experimental e∗(T ) dependence exhibits the characteristic S-shape at e∗ = 2 − 3 MeV/A. Such behavior is expected for a finite system at a phase transition. The observed dependence agrees with predictions of the MMMC-model, which simulates the total accessible phase-space of fragmentation. 25.70Np 05.70Fh 21.10Ma Typeset using REVTEX

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تاریخ انتشار 1999