The incident energy at which the azimuthal distributions in semicentral hea
vy-ion collisions change from in-plane to out-of-plane enhancement - E-tran
is studied as a function of mass of emitted particles, their transverse mo
mentum and centrality for Au + Au collisions. The analysis is performed in
a reference frame rotated with the sidewards flow angle (Theta (flow)) rela
tive to the beam axis.
A systematic decrease of E-tran as function of mass of the reaction product
s, their transverse momentum and collision centrality is evidenced.
The predictions of a microscopic transport model (IQMD) are compared with t
he experimental results. (C) 2001 Elsevier Science B.V. All rights reserved