Scaling of anisotropy flows in intermediate energy heavy ion collisions

Anisotropic flows (v1, v2 and v4) of light nuclear clusters are studied by a nucleonic transport model in intermediate energy heavy ion collisions. The number-of-nucleon scalings of the directed flow (v1) and elliptic flow (v2) are demonstrated for light nuclear clusters. Moreover, the ratios of of nuclear clusters show a constant value of 1/2 regardless of the transverse momentum. The above phenomena can be understood by the coalescence mechanism in nucleonic level and are worthy to be explored in experiments.