Centrality Determination Method in Nuclear Collisions by Using Hadron Calorimeter

Determining centrality is an important task because it allows estimating the size of the collision system in relativistic heavy ion collisions. It provides a tool for comparison of the results from upcoming measurements with the Multi-Purpose Detector (MPD) at NICA with data from other experiments and theoretical model calculations. In this work, a new procedure for centrality determination based on the energy of spectator fragments has been proposed. The validity of the procedure has been checked using the published data from the NA61/SHINE experiment for Pb + Pb collisions at beam momentum pbeam = 13 A GeV/c ( $$\sqrt {{{s}_{{NN}}}} $$ = 5.2 GeV).