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

X. Liu (刘星泉), W. Lin (林炜平), M. Huang (黄美容), R. Wada, J. Wang (王建松), Z. Chen (陈志强), Q. Wang (王琦), P. Ren (任培培), Y. Yang (杨彦云), S. Jin (金仕纶), P. Ma (马朋), J. Ma (马军兵), Z. Bai (白真), and Q. Hu (胡强)
Phys. Rev. C 92, 014623 – Published 27 July 2015

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/ρ00.65 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/ρ01.3 at 35 MeV/nucleon to 1.8 at 300 MeV/nucleon. Flat temperature values of T5.9 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.

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  • Received 22 September 2014
  • Revised 1 July 2015

DOI:https://doi.org/10.1103/PhysRevC.92.014623

©2015 American Physical Society

Authors & Affiliations

X. Liu (刘星泉)1,*, W. Lin (林炜平)1,2, M. Huang (黄美容)3, R. Wada3, J. Wang (王建松)1, Z. Chen (陈志强)1, Q. Wang (王琦)1, P. Ren (任培培)1,2, Y. Yang (杨彦云)1, S. Jin (金仕纶)1, P. Ma (马朋)1, J. Ma (马军兵)1, Z. Bai (白真)1, and Q. Hu (胡强)1

  • 1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA

  • *liuxingquan@impcas.ac.cn

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Vol. 92, Iss. 1 — July 2015

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