Azimuthal Anisotropy of the Emission of Fragments and Relativistic Particles in Collisions between Iron Nuclei of Momentum 2.5 GeV/c per Nucleon and Photoemulsion Nuclei

摘要

The azimuthal anisotropy of the emission of fragments and relativistic particles in collisions between ~(56)Fe nuclei of momentum 2.5 GeV/c per nucleon and photoemulsion nuclei is measured. For semicentral collisions at impact-parameter values in the range 0.12 ≤ b/b_(max) ≤ 0.70, charged fragments and relativistic particles are predominantly emitted in the direction orthogonal to the nuclear-reaction plane. The azimuthal-asymmetry parameter P_2 for fragments whose charge numbers are Z = 1,2 and Z ≥ 3 takes values of, respectively, -0.192 ± 0.057, -0.28 ± 0.07, and -0.39 ± 0.12. Evaporated b particles have an isotropic azimuthal distribution.