Nucleon number dependence of longitudinal radii in ion-ion collisions as a signature of the onset of collective expansion
Jan Pisut, Neva Pisutova, Petr Zavada
Abstract
In an attempt to disentangle the effects of nuclear geometry from those of nuclear geometry we study dependence of longitudinal radius on nucleon numbers of colliding nuclei within a simple model of multiple nucleon- nucleon collisions.We discuss two approaches to resulting simple formula.In the former the data up to S-Au can be described by nuclear geometry at the price of two parameters,but RL for Pb-Pb is significantly larger than geometry can accomodate, indicating an onset of a new dynamics. In the latter even collisions induced by lighter ions give evidence of some collective behaviour and the increase of RL for Pb-Pb indicates again the onset of a new dynamics.
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