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arXiv 1702.07459nucl-th
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Glauber模型与重离子反应和弹性散射截面

The Glauber model and heavy ion reaction and elastic scattering cross sections

Ajay Mehndiratta, Prashant Shukla

摘要:

我们重新使用Glauber模型研究了中低能重离子的反应截面和弹性散射角分布。Glauber模型以核子-核子截面和核密度为输入,没有自由参数,因此可以预测未知体系的截面。Glauber模型在低能量下工作到库仑势垒,只需非常简单的修改。本文提出了pp和np碰撞总截面和散射振幅的实部与虚部之比作为核子动能函数的新参数化。计算中使用了在大动量转移范围内测量的电子散射形状因子所得到的核(电荷)密度。计算了轻、重体系的重离子反应截面,并与大能量范围内的实测数据进行了比较。该模型对数据进行了很好的描述。计算了不同能量下各种体系的弹性散射角分布。该模型在小动量转移时能很好地描述数据,但在大动量转移时计算结果与数据有偏差。

英文摘要:

We revisit the Glauber model to study the heavy ion reaction cross sections and elastic scattering angular distributions at low and intermediate energies. The Glauber model takes nucleon-nucleon cross sections and nuclear densities as inputs and has no free parameter and thus can predict the cross sections for unknown systems. The Glauber model works at low energies down to Coulomb barrier with very simple modifications. We present new parametrization of measured total cross sections as well as ratio of real to imaginary parts of the scattering amplitudes for pp and np collisions as a function of nucleon kinetic energy. The nuclear (charge) densities obtained by electron scattering form factors measured in large momentum transfer range are used in the calculations. The heavy ion reaction cross sections are calculated for light and heavy systems and are compared with available data measured over large energy range. The model gives excellent description of the data. The elastic scattering angular distributions are calculated for various systems at different energies. The model gives good description of the data at small momentum transfer but the calculations deviate from the data at large momentum transfer.

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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