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arXiv 0802.0259nucl-th
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重离子碰撞中的热化

Thermalization in Heavy-Ion Collisions

Dmitry Anchishkin, Stanislav Yezhov

摘要:

本文提出了一个两核碰撞产生的核子系统中各向同性化和相应热化的模型。该模型基于这样的假设:在火球演化过程中,两粒子的弹性碰撞和非弹性碰撞导致核子动量转移的随机化,而核子动量转移是由一个适当的分布驱动的。作为第一近似,我们假设一个均匀分布的动量传递的值是有界的。这些特征已被证明会导致粒子动量在它们的初始值附近出现拖尾,从而导致它们的部分各向同性和热化。得到了带有核初态记忆的非平衡单粒子分布函数和单粒子谱。

英文摘要:

We propose a model for isotropization and corresponding thermalization in a nucleon system created in the collision of two nuclei. The model is based on the assumption: during the fireball evolution, two-particle elastic and inelastic collisions give rise to the randomization of the nucleon-momentum transfer which is driven by a proper distribution. As a first approximation, we assume a homogeneous distribution where the values of the momentum transfer is bounded from above. These features have been shown to result in a smearing of the particle momenta about their initial values and, as a consequence, in their partial isotropization and thermalization. The nonequilibrium single-particle distribution function and single-particle spectrum which carry a memory about initial state of nuclei have been obtained.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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