ENERGY-SPECTRA AND ANGULAR-DISTRIBUTION OF INTERMEDIATE-MASS FRAGMENTS EMITTED IN AU AG(P,X) REACTIONS WITH EP=12 GEV - (THE FIRST RESULT OF THE KEK-12GEV-PS EXPERIMENT E288)/

The latest results of the first nuclear multifragmentation experiment, E288 [1], at the KEK 12 GeV Proton Synchrotron (KEK-PS) are presented . The energy spectra of intermediate mass fragments (IMFs) were measur ed inclusively from 30 degrees to 150 degrees with 20 degrees step in the lab. system. Coincidence measurements with one extra IMF emitted t oward 90 degrees direction in the opposite hemisphere were performed a t the same time. Characteristic sideward flow of IMFs toward 70 degree s direction was found with the usual isotropic component. This isotrop ic component was strongly suppressed in the coincidence measurement. T hese facts may indicate the formation of unusually shaped nuclear matt er such as an expanding toroid.