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., …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