Phenomenological Scaling of Rapidity Dependence for Anisotropic Flows in 25MeV/nucleon Ca+Ca 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 25MeV/nucleon ⁴⁰Ca + ⁴⁰Ca at large
impact parameters by a quantum molecular dynamics model. A phenomenological scaling behaviour of rapidity dependent flow parameters v_n (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, v₄v₂² keeps to be almost independent of rapidity and remains a
rough constant of 1/2 for all light fragments.