Nucleon-number scalings of anisotropic flows and nuclear modification factor for light nuclei in the squeeze-out region

Abstract

The number of nucleon (NN) scaling of the directed flow $v_1$ and elliptic flow ($v_2$) as well as the nuclear modification factor ($R_{cp}$) are tested for light nuclei which are produced in 0.4$A$ 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 $v_1$, $v_2$ and $R_{cp}$. These results demonstrate that the nucleon coalescence mechanism is responsible for nucleon-number scaling of above physical observables in squeeze-out region in heavy-ion collisions at intermediate energy.

Comments: 8 pages, 6 figures