论文标题
Prex和Crex的精密Møller极化法
Precision Møller Polarimetry for PREX and CREX
论文作者
论文摘要
杰斐逊实验室A厅的Prex-2和Crex实验是违反复合核的弹性电子散射的均衡测量的精确度量。一个要求是，以1 \％的精度知道，入射电子束极化（通常为$ \ $ 90 \％）已知。我们在超过此要求的梁线上委托并操作了Møller偏振仪，对于PREX-2，精度为0.89 \％，CREX的精度为0.85 \％。不确定性纯粹是系统的，是从几种不同的来源积累的，但由我们对目标极化的了解所占据主导地位。我们的分析还证明了需要准确的原子波函数以纠正列夫丘克效应。我们描述了偏振仪操作和分析的细节，以及（对于Crex）与基于康普顿散射的不同偏振计的结果进行了比较。
The PREX-2 and CREX experiments in Hall A at Jefferson Lab are precision measurements of parity violating elastic electron scattering from complex nuclei. One requirement was that the incident electron beam polarization, typically $\approx$90\%, be known with 1\% precision. We commissioned and operated a Møller polarimeter on the beam line that exceeds this requirement, achieving a precision of 0.89\% for PREX-2, and 0.85\% for CREX. The uncertainty is purely systematic, accumulated from several different sources, but dominated by our knowledge of the target polarization. Our analysis also demonstrates the need for accurate atomic wave functions in order to correct for the Levchuk Effect. We describe the details of the polarimeter operation and analysis, as well as (for CREX) a comparison to results from a different polarimeter based on Compton scattering.
