Dispersive corrections in elastic electron-nucleus scattering: an investigation in the intermediate energy regime and their impact on the nuclear matter

Dispersive corrections in elastic electron-nucleus scattering: an investigation in the intermediate energy regime and their impact on the nuclear matter
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弹性电子-核散射的色散校正:中间能状态及其对核物质影响的研究

DOI:
10.1140/epja/s10050-020-00135-7
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发表时间:
2020
期刊:
The European Physical Journal A
影响因子:
--
通讯作者:
Sarty, A. J.
Sarty, A. J.
中科院分区:
--
文献类型:
--
作者:
Guèye, P.;Kabir, A. A.;Giuliani, P.;Glister, J.;Lee, B. W.;Gilman, R.;Higinbotham, D. W.;Piasetzky, E.;Ron, G.;Sarty, A. J.

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过去十年中弹性电子散射数据的测量强调了双光子交换贡献是精确评估氢弹性散射截面的理论计算的必要组成部分。这种修正可以在百分之几的水平上修改横截面。相反,色散效应可能会导致玻恩近似发生显着更大的变化。本实验的目的是提取第一个衍射最小值周围的碳 12 弹性横截面,其中玻恩项对横截面的贡献很小,以最大限度地提高对色散效应的敏感性。该分析使用来自高分辨率 Jefferson Lab Hall A 光谱仪的 LEDEX 数据来提取在 362 MeV 和 685 MeV 光束能量下 C 的第一衍射最小值附近的横截面。结果与以前的世界数据非常吻合,尽管精度较低。线性和二次拟合预期的静态核电荷分布的平均偏差表明色散效应对 1 GeV 横截面的贡献为 30.6%。 C 的第一衍射最小值附近的色散效应的幅度已被证实很大,具有很强的能量依赖性,并且可以解释所观察到的纵向核响应猝灭的很大一部分幅度。这些效应对于从衍射最小值附近测量的宇称破坏不对称性中提取的核半径也可能很重要。
Measurements of elastic electron scattering data within the past decade have highlighted two-photon exchange contributions as a necessary ingredient in theoretical calculations to precisely evaluate hydrogen elastic scattering cross sections. This correction can modify the cross section at the few percent level. In contrast, dispersive effects can cause significantly larger changes from the Born approximation. The purpose of this experiment is to extract the carbon-12 elastic cross section around the first diffraction minimum, where the Born term contributions to the cross section are small to maximize the sensitivity to dispersive effects. The analysis uses the LEDEX data from the high resolution Jefferson Lab Hall A spectrometers to extract the cross sections near the first diffraction minimum ofC at beam energies of 362 MeV and 685 MeV. The results are in very good agreement with previous world data, although with less precision. The average deviation from a static nuclear charge distribution expected from linear and quadratic fits indicate a 30.6% contribution of dispersive effects to the cross section at 1 GeV. The magnitude of the dispersive effects near the first diffraction minimum ofC has been confirmed to be large with a strong energy dependence and could account for a large fraction of the magnitude for the observed quenching of the longitudinal nuclear response. These effects could also be important for nuclei radii extracted from parity-violating asymmetries measured near a diffraction minimum.
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