The number of nucleon (NN) scaling of the directed flow v1 and elliptic flow (v2) as well as the nuclear modification factor (Rcp) are tested for light nuclei which are produced in 0.4A GeV 197 Au + 197 Au collisions at different impact parameters with two different in-medium nucleon-nucleon cross sections in the framework of an isospin-dependent quantum molecular dynamics (IQMD) model. In that energy domain, the emission of light nuclei can be well described by the squeeze-out phenonomenon. The results show a nice NN scaling behavior for flow parameters v1, v2 and Rcp. These results demonstrate that the nucleon coalescence mechanism is responsible for nucleon-number scaling of above physical observables in squeezeout region in heavy-ion collisions at intermediate energy.
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