Abstract

A hydrodynamic approach involving a nonequilibrium equation of state is used in describing heavy-ion collisions at medium and intermediate energies. The double differential cross sections for proton and photon emission in collisions of various nuclei are calculated in developing this approach with allowance for nuclear-viscosity effects and amendments introduced by the microcanonical distribution. The results agree everywhere, including the cumulative region of the spectrum, with available experimental data on the emission of high-energy particles. The approach in question permits reproducing high-momentum distributions of protons from the reaction \({}^{12}\textrm{C}+\,^{9}\textrm{Be}\to p+X\) at the \({}^{12}\)C ion energies of 300, 600, 950, and 2000 MeV per nucleon and the energy spectra of hard photons from the reaction \({}^{12}\textrm{C}+\,^{9}\textrm{Be}\to\gamma+X\) at the \({}^{12}\)C ion energies of 2.0 and 3.2 GeV per nucleon.

中文翻译：

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基于非平衡状态方程的流体动力学方法处理重离子碰撞中的高能质子和光子的发射

摘要

涉及非平衡状态方程的流体力学方法用于描述中，中等能量下的重离子碰撞。在开发这种方法时，考虑到核粘性效应和微规范分布引入的修正，计算了各种核碰撞中质子和光子发射的双微分截面。结果在任何地方（包括光谱的累积区域）都与有关高能粒子发射的可用实验数据一致。在问题允许再现从反应质子的高动量分布的方法\（{} ^ {12} \ TEXTRM {C} + \，^ {9} \ TEXTRM {成为} \至p + X \）在\ （{} ^ {12} \）每个核子的C离子能量分别为300、600、950和2000 MeV，以及反应\（{} ^ {12} \ textrm {C} + \，^ {9} \ textrm {Be}的硬光子能谱在每个核子的（{} ^ {12} \） C离子能量下为\ to \ gamma + X \。