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Many-particle correlations and Coulomb effects on temperatures from fragment momentum fluctuations

机译：来自片段动量波动的温度的许多粒子相关性和库仑效应

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摘要

We investigate correlations in the fragment momentum distribution owing to the propagation of fragments under the influence of their mutual Coulomb field after the breakup of an excited nuclear source. The magnitude of the effects on the nuclear temperatures obtained from such distributions is estimated with the help of a simple approach in which a charged fragment interacts with a homogeneous charged sphere. The results are used to correct the temperatures obtained from the asymptotic momentum distributions of fragments produced by a Monte Carlo simulation in which the system's configuration at breakup is provided by the canonical version of the statistical multifragmentation model. In a separate calculation, the dynamics of this many-particle charged system is followed in a molecular dynamics calculation until the fragments are far away from the breakup volume. The results suggest that, although themagnitude of the corrections is similar in both models, many-particle correlations present in the second approach are non-negligible and should be taken into account to minimize ambiguities in such studies.
机译：我们在兴奋核源分解后的相互库仑场的影响下，调查片段动量分布的相关性。借助于一种简单的方法，估计从这种分布获得的核温度的效果的大小估计，其中带电片段与均匀的带电球相互作用。结果用于校正由Monte Carlo模拟产生的片段的渐近动量分布所获得的温度，其中系统在分解时的配置由统计多条分类模型的规范版本提供。在单独的计算中，在分子动力学计算中遵循该许多粒子电荷系统的动态，直到碎片远离分解体积。结果表明，尽管两种模型中的校正的对数相似，但是在第二种方法中存在的许多粒子相关性是不可忽略的，并且应该考虑到最小化这些研究中的模糊。

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  • 来源
    《Physical review, C》 |2017年第1期|共6页
  • 作者

    Souza S. R.; Tsang M. B.; Donangelo R.;

  • 作者单位

    Univ Fed Rio de Janeiro Inst Fis Cidade Univ CP 68528 BR-21941972 Rio De Janeiro Brazil;

    Michigan State Univ Nat Superconducting Cyclotron Lab E Lansing MI 48824 USA;

    Univ Fed Rio de Janeiro Inst Fis Cidade Univ CP 68528 BR-21941972 Rio De Janeiro Brazil;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
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