MULTIFRAGMENTATION INDUCED BY RELATIVISTIC ALPHA-PROJECTILES

Multifragmentation of the system alpha+ Au-197 has been studied at inc ident energies of 1 and 3.6 GeV/nucleon with the new 4pi setup, FASA. Mass, energy, and velocity of a few fragments are measured with high p recision using time-of-flight telescopes, while for the other fragment s, global multiplicity information is obtained from 55 CsI(Tl) detecto rs covering the main part of 4pi. Very high mean IMF (intermediate mas s fragment) multiplicities of [M]IMF=5.1 +/- 0.8 are observed at the h igher incident energy. Compared to the lower incident energy, they inc rease by 40%, indicating an increasing energy deposition with increasi ng incident energy.