Isoscaling behavior in the Isospin dependent Quantum Molecular Dynamics model

Abstract

The isoscaling behavior is investigated in the frame of Isospin dependent Quantum Molecular Dynamics (IQMD) models. The isotopic yields ratio $Y_2$/$Y_1$ for reactions ${}^{48}Ca$+${}^{48}Ca$ and ${}^{40}Ca{+}^{40}Ca$ at different entrance channels are simulated and presented, the relationship between the isoscaling parameter and the entrance channel is analyzed, the results show that $\alpha$ and $\beta$ reduce with the rise of incident energies and increase with the impact parameter b, which can be attributed to the temperature varying of the pre-fragments in different entrance channels. The relation of $\alpha$ and symmetry-term coefficient $C_{sym}$ reveals that the chemical potential difference $△\mu$ is sensitive to the symmetry-term coefficient $C_{sym}$.

4 pages, 4 figures; revised version to Chinese Physics Letters