Energy dependence of femtoscopy properties of pion source in nuclear collisions

Abstract

In the paper energy dependence of femtoscopy characteristics of pion emission region at freeze-out is investigated for collisions of various ions and for all experimentally available energies. For the first time the normalized values of radii and volume of source are used for energy dependence. This approach allows us to expand the set of interaction types, in particular, on non-symmetrical nucleus-nucleus collisions which can be studied in the framework of common approach. There are no the sharp changing of femtoscopic parameter values, in particular, $R_{o}/R_{s}$ with increasing of $\sqrt{s_{NN}}$ which were predicted by some phenomenological models as signature of first order phase transition in strongly interacting matter. The generalized parameterization for femtoscopic correlation function is suggested.