Abstract
The experimental liquid-gas phase transition signals are examined for the quasiprojectile (QP) reconstructed from the reactions of $^{40}\mathrm{Ar}+^{27}\mathrm{Al}$, $^{48}\mathrm{Ti}$, $^{58}\mathrm{Ni}$ at 47 MeV/nucleon, using measures of caloric curve, multiplicity derivative, moment parameters, and fluctuation of maximum fragment charge number (NVZ). The QP source is reconstructed, using moving source parametrizations on an event-by-event basis. For the determination of the temperature, a quadrupole fluctuation thermometer is used. Deuterons are chosen for the thermometer to minimize the Coulomb and secondary sequential decay effects. A new event-by-event method is proposed for the thermometer to determine the temperature. All measures show a characteristic signature around the temperature $T=9.0\ifmmode\pm\else\textpm\fi{}0.4$ MeV, which may suggest that the QP system goes into the liquid-gas phase transition at ${T}_{c}=8.3\ifmmode\pm\else\textpm\fi{}0.4$ MeV after the Coulomb correction.
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