Forward Energy and Multiplicity in Au-Au reactions at sqrt{S}=130GeV

Abstract

For relativistic heavy ion collisions the energy flow in the collision reveals information on the equation of state of matter at high density. The BRAHMS experiment has studied the relation between multipliciity in the sidewards direction and zero degree energy using our Tile Multiplicity Array and Zero Degree Calorimeters. To understand this spectrum requires a knowledge of the coalesence of nucleons that are close in phase space. We have also studied electromagnetic collisions and compared our results to lower energy data. As the center of mass energy increases, each nucleus sees a stronger electromagnetic field resulting in more energy being absorbed. This in turn causes an increase in the neutron multiplicity.