中能区弹性电子-核散射中玻恩近似的色散修正
核实验
2020-05-21 v3 核理论
摘要
过去十年的弹性电子散射测量表明，双光子交换贡献是理论计算中精确评估氢弹性散射截面的必要组成部分。该修正可在百分之几的程度上改变截面。相比之下，色散效应会引起比玻恩近似显著更大的变化。本实验的目的是提取碳-12 在第一个衍射极小附近的弹性截面，此处玻恩项对截面的贡献很小，以最大化对色散效应的灵敏度。分析使用来自杰斐逊实验室 Hall A 高分辨率谱仪的 LEDEX 数据，在 362 MeV 和 685 MeV 束流能量下提取 12C 第一个衍射极小附近的截面。结果与先前世界数据非常一致，尽管精度较低。由线性和二次拟合得到的与静态核电荷分布的偏离平均表明，在 1 GeV 处色散效应对截面的贡献为 30.6%。12C 第一个衍射极小附近色散效应的量级已被确认为很大且具有强烈的能量依赖性，并可能占观测到的纵向核响应淬灭量级的大部分。这些效应对于从衍射极小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。
引用
@article{arxiv.1805.12441,
title = {Dispersive Corrections to the Born Approximation in Elastic Electron-Nucleus Scattering in the Intermediate Energy Regime},
author = {P. Gueye and A. A. Kabir J. Glister and B. W. Lee and R. Gilman and D. W. Higinbotham and E. Piasetzky and G. Ron and A. J. Sarty and S. Strauch and A. Adeyemi and K. Allada and W. Armstrong and J. Arrington and H. Arenhovel and A. Beck and F. Benmokhtar and B. L. Berman and W. Boeglin and E. Brash and A. Camsonne and J. Calarco and J. P. Chen and S. Choi and E. Chudakov and L. Coman and B. Craver and F. Cusanno and J. Dumas and C. Dutta and R. Feuerbach and A. Freyberger and S. Frullani and F. Garibaldi and J. -O. Hansen and T. Holmstrom and C. E. Hyde and H. Ibrahim and Y. Ilieva and X. Jiang and M. K. Jones and A. T. Katramatou and A. Kelleher and E. Khrosinkova and E. Kuchina and G. Kumbartzki and J. J. LeRose and R. Lindgren and P. Markowitz and S. May-Tal Beck and E. McCullough and D. Meekins and M. Meziane and Z. -E. Meziani and R. Michaels and B. Moffit and B. E. Norum and G. G. Petratos and Y. Oh and M. Olson and M. Paolone and K. Paschke and C. F. Perdrisat and M. Potokar and R. Pomatsalyuk and I. Pomerantz and A. Puckett and V. Punjabi and X. Qian and Y. Qiang and R. D. Ransome and M. Reyhan and J. Roche and Y. Rousseau and B. Sawatzky and E. Schulte and M. Schwamb and M. Shabestari and A. Shahinyan and R. Shneor and S. Sirca and K. Slifer and P. Solvignon and J. Song and R. Sparks and R. Subedi and G. M. Urciuoli and K. Wang and B. Wojtsekhowski and X. Yan and H. Yao and X. Zhan and X. Zhu},
journal= {arXiv preprint arXiv:1805.12441},
year = {2020}
}
备注
14 pages, 10 figures