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Beam-normal single-spin asymmetry in elastic scattering of electrons from a spin-0 nucleus
Physical Review C ( IF 3.2 ) Pub Date : 2021-06-15 , DOI: 10.1103/physrevc.103.064316
Oleksandr Koshchii , Mikhail Gorchtein , Xavier Roca-Maza , Hubert Spiesberger

We study the beam-normal single-spin asymmetry (BNSSA) in high-energy elastic electron scattering from several spin-0 nuclei. Existing theoretical approaches work in the plane-wave formalism and predict the BNSSA to scale as A/Z with the atomic number Z and nuclear mass number A. While this prediction holds for light and intermediate nuclei, a striking disagreement in both the sign and the magnitude of BNSSA was observed by the PREX collaboration for Pb208, coined the “PREX puzzle.” To shed light on this disagreement, we go beyond the plane-wave approach which neglects Coulomb distortions known to be significant for heavy nuclei. We explicitly investigate the dependence of BNSSA on A and Z by (i) including inelastic intermediate states' contributions into the Coulomb problem in the form of an optical potential, (ii) by accounting for the experimental information on the A-dependence of the Compton slope parameter, and (iii) giving a thorough account of the uncertainties of the calculation. Despite of these improvements, the PREX puzzle remains unexplained. We discuss further strategies to resolve this riddle.

中文翻译:

来自自旋 0 核的电子弹性散射中的束法向单自旋不对称性

我们研究了来自几个自旋 0 原子核的高能弹性电子散射中的束法向单自旋不对称性 (BNSSA)。现有的理论方法适用于平面波形式主义,并预测 BNSSA 将按比例缩放一种/Z 与原子序数 Z 和核质量数 一种. 虽然这种预测适用于轻核和中间核,但 PREX 合作观察到了 BNSSA 的符号和大小的惊人分歧208,创造了“PREX拼图”。为了阐明这种分歧,我们超越了平面波方法,该方法忽略了已知对重核很重要的库仑畸变。我们明确调查了 BNSSA 对一种Z 通过 (i) 以光学势的形式将非弹性中间态对库仑问题的贡献包括在内,(ii) 通过考虑关于 一种- 康普顿斜率参数的相关性,以及 (iii) 全面考虑计算的不确定性。尽管有这些改进,但 PREX 难题仍然无法解释。我们讨论了解决这个谜题的进一步策略。
更新日期:2021-06-15
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