Freezeout concept and dynamical transport model in intermediate-energy heavy-ion reactions

Liu, X.; Lin, W.; Huang, M.; Wada, R.; Wang, J.; Chen, Z.; Wang, Q.; Ren, P.; Yang, Y.; Jin, S.; Ma, P.; Ma, J.; Bai, Z.; Hu, Q.

Abstract

For the central collision events of 40Ca+40Ca, generated by an antisymmetrized molecular dynamics model in the intermediate energy range of 35 to 300 MeV/nucleon, the density and temperature of a fragmenting source have been extracted using a self-consistent method with the modified Fisher model. Rather flat density values,
ρ/ρ0∼0.65 to 0.7, are evaluated at the incident energies studied, even though the maximum density of the system achieved during the collisions increases monotonically from ρ/ρ0∼1.3 at 35 MeV/nucleon to 1.8 at 300 MeV/nucleon. Flat temperature values of T∼5.9 to 6.5 MeV are also extracted in this incident energy range. These extracted values indicate that, in average, intermediate mass fragments are formed at a later stage when the hot nuclear matter reaches at a “freezeout” volume by the expansion, which is not assumed in any transport models, but assumed generally in statistical multifragmentation models. This is the first time to demonstrate quantitatively a direct connection between the freezeout concept and transport model simulations in a multifragmenting regime of heavy ion collisions.

Citation

Liu, X., Lin, W., Huang, M., Wada, R., Wang, J., Chen, Z., Wang, Q., Ren, P., Yang, Y., Jin, S., Ma, P., Ma, J., Bai, Z., & Hu, Q. Freezeout concept and dynamical transport model in intermediate-energy heavy-ion reactions. Physical Review C - Nuclear Physics, 92(1), https://doi.org/10.1103/physrevc.92.014623

• Journal Article Type: Article
• Online Publication Date: Jul 27, 2015
• Deposit Date: Jun 9, 2023
• Journal: Physical Review C
• Print ISSN: 0556-2813
• Electronic ISSN: 1089-490X
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 92
• Issue: 1
• DOI: https://doi.org/10.1103/physrevc.92.014623
• Keywords: Nuclear and High Energy Physics
• Public URL: https://keele-repository.worktribe.com/output/444409