Phenomenological Scaling of Rapidity Dependence for Anisotropic Flows in 25 MeV/nucleon CaCa by Quantum Molecular Dynamics Model.

Anisotropic flows (v1, v2, v3 and v4) of light fragments up to the mass number 4 as a function of rapidity are studied for 25 MeV/nucleon 40Ca + 40Ca at large impact parameters by a quantum molecular dynamics model. A phenomenological scaling behaviour of rapidity dependent flow parameters vn (n = 1, 2, 3 and 4) is found as a function of mass number plus a constant term, which may arise from the interplay of collective and random motions. In addition, v4/v22 keeps to be almost independent of rapidity and remains a rough constant of 1/2 for all light fragments. [ABSTRACT FROM AUTHOR]