Probing the EOS and nn cross section by analyzing the collective flow at high and intermediate energy in the RVUU approach |
| |
Authors: | Hongbo Zhou Zhuxia Li Yizhong Zhuo Guangjun Mao |
| |
Institution: | Institute of Atomic Energy, P.O. Box 275(18), Beijing, 102 413, China |
| |
Abstract: | We have studied the collective flow at high and intermediate energy in a relativistic Vlasov-Uehling-Uhlenbeck (RVUU) approach based on Walecka's QHD-I model, with the aim to probe the nuclear-matter equation of state (EOS) and the in-medium nucleon-nucleon cross section σ. At high energy (1.2 GeV/u), the out-of-plane azimuthal correlation function C(Ψ) is only sensitive to the effective mass m* and insensitive to the nuclear compressibility K and the effective nucleon-nucleon cross section σ within a reasonable range. We have found that the preferred value of m* is about 0.85 m. With this value of m*, from the in-plane mean transverse momentum Px(Y) which is sensitive to both m* and σ we have drawn an effective nn cross section σ, namely σ 0.8σf where σf is the free nucleon-nucleon cross section in Cugnon's parametrization. Taking advantage of the fact that the energy of vanishing flow (EVF) at intermediate energy (around 100 MeV/u) is only sensitive to the nucleon-nucleon cross section σ, we have drawn some information on the nucleon-nucleon cross section σ, namely σ = (1.4±0.2)σf. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|