Abstract
Multifragmentation of the system \ensuremath{\alpha}${+}^{197}$Au has been studied at incident energies of 1 and 3.6 GeV/nucleon with the new 4\ensuremath{\pi} setup, FASA. Mass, energy, and velocity of a few fragments are measured with high precision using time-of-flight telescopes, while for the other fragments, global multiplicity information is obtained from 55 CsI(Tl) detectors covering the main part of 4\ensuremath{\pi}. Very high mean IMF (intermediate mass fragment) multiplicities of 〈M${\mathrm{〉}}_{\mathrm{IMF}}$=5.1\ifmmode\pm\else\textpm\fi{}0.8 are observed at the higher incident energy. Compared to the lower incident energy, they increase by 40%, indicating an increasing energy deposition with increasing incident energy.
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