Relation between temperature and excitation energy of hot nuclei in the reaction of 40Ar + 197Au at 25 MeV/u

For the reaction of 25 MeV/u 40Ar with 197Au, coincidence measurements have been made for the heavy residue fission fragments and light charged particles (Z≤2). The folding-angle and time of flight of heavy residue fission fragments were used to deduce the linear momentum transfer (LMT). The initial properties of these nuclei, excitation energies, angular momenta and temperatures, have been studied by measuring LMT and light particle spectra. The relations between the excitation energy per nucleon and temperature is analysed by different windows of LMT. It is shown that the hot nuclei are close to saturation of temperature for central collision and close to 'phase transition for multifragmentation'