相对论与16O（e，e'p）中的交换电流
Relativity versus exchange currents in 16O(e,e'p)
摘要：
在准弹性区域的16 O（e，e'p）反应已经在几个实验中进行了研究，以确定光谱因子，因此，在何种程度上$^{16}$ O看起来像一个封闭的壳。通过改变运动学，实验者能够提取包括截面的响应函数。然而，响应函数的分析分别产生非常不同的光谱因子。关于交换电流是否可以消除这种差异，两种计算得出了不同的结论。这两种计算都没有考虑相对论修正。本文的目的是调查的分歧，是否交换电流的解决方案，以获得一致的光谱因子，并表明相对论修正有更大的影响，提供这种一致性。该计算采用反冲校正连续壳模型，该模型使用现实的相互作用，并产生非伪散射状态，这些状态是耦合通道问题的解决方案。根据Dubach、Koch和Donnelly提出的方法计算了交换电流的π介子和电子对贡献。通过使用直接泡利约化，包含了相对论效应。交换电流的贡献被证明是不足以提供一致的光谱因子。然而，包含相对论修正，这可能是大的，导致更一致的光谱因子和截面。通道耦合的影响也被证明是显着的。当前守恒的测试表明，包括直接泡利约化产生小的增加，其违反。依赖于横向电流的响应函数对相对论性波函数的较低分量敏感，因此，将提供任何相对论性模型的适当性的度量。
英文摘要：
The 16O(e,e'p) reaction in the quasi-elastic region has been studied in several experiments to determine spectroscopic factors, hence, the degree to which $^{16}$O looks like a closed shell. By varying the kinematics, experimentalists are able to extract response functions which comprise the cross section. However, analysis of the response functions separately produces very different spectroscopic factors. Two calculations led to different conclusions as to whether exchange currents can eliminate the discrepancies. Neither calculation considered relativistic corrections. The purpose of the article is to investigate the disagreement as to whether exchange currents are the solution to obtaining consistent spectroscopic factors, and to show that relativistic corrections have a much greater influence on providing this consistency. This calculation employs the recoil corrected continuum shell model, a model that uses a realistic interaction, and produces non-spurious scatterings states that are solutions to the coupled channels problems. Pionic and pair contributions to the exchange currents were calculated as developed by Dubach, Koch, and Donnelly. Relativistic effects are included by use of the direct Pauli reduction. Contributions of the exchange currents are shown to be insufficient to provide consistent spectroscopic factors. However, the inclusion of relativistic corrections, that can be large, lead to more consistent spectroscopic factors and cross sections. The influence of channel coupling is also shown to be significant. Tests of current conservation show that inclusion of the direct Pauli reduction produces small increases in its violation. Response functions which depend on the transverse current are sensitive to the lower component of relativistic wave functions, and hence, would provide a measure of the appropriateness of any relativistic model.
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