Selection of central events in intermediate energy heavy-ion collisions

We introduce the centrality parameter which measures the degree of departure from axial symmetry of the reaction products in a nearly head-on collision. The centrality parameter can be used to select events which are nearly head-on in order to facilitate comparison of experimental results with theoretical predictions.

Research sponsored by the Division of Physical Research, U.S. Department of Energy, under contract W-7405-eng-26 with the Union Carbide Corporation.