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A new method for evaluating spectra and correlations in the hydrodynamicapproach is proposed. It is based on an analysis of Boltzmann equations (BE) interms of probabilities for constituent particles to escape from the interactingsystem. The conditions of applicability of Cooper-Frye freeze-out prescriptionare considered within the method. The results are illustrated with anon-relativistic exact solution of BE for expanding spherical fireball as wellas with approximate solutions for ellipsoidally expanding ones.Comment: 4 pages including 2 figures, RevTex, stylistic and clarifying  corrections are made, submitted to Phys. Rev. Let

physical review letters

Freeze-Out Problem in Hydrokinetic Approach to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>A</mml:mi><mml:mo>+</mml:mo><mml:mi>A</mml:mi></mml:math>Collisions

Freeze-Out Problem in Hydrokinetic Approach toA+ACollisions