标题： $^{40}$Ar(e,e$^{\prime}$) 弹性散射截面的测量，使用一种新型气流靶 显示英文标题

标题： Measurement of the $^{40}$Ar(e,e$^{\prime}$) elastic scattering cross section with a novel gas-jet target

摘要： 我们报告了在Mainz Microtron加速器MAMI上使用一种新型低温气体喷射靶进行的弹性电子散射测量。亮度通过靶的热力学参数以及与扭曲波玻恩近似计算的比较来估计。在新的动量转移1.24 fm$^{-1}$和1.55 fm$^{-1}$处测得的截面与使用传统高压气体靶进行的先前实验以及采用从手征有效场论中得出的最新核力的现代从头算计算结果一致。几乎无背景的测量突显了气体喷射靶在比氢更重元素中的最佳特性，使在强子和核物理中的新应用成为可能。 显示英文摘要

摘要： We report on a measurement of elastic electron scattering on argon performed with a novel cryogenic gas-jet target at the Mainz Microtron accelerator MAMI. The luminosity is estimated with the thermodynamical parameters of the target and by comparison to a calculation in distorted-wave Born approximation. The cross section, measured at new momentum transfers of 1.24 fm$^{-1}$ and 1.55 fm$^{-1}$ is in agreement with previous experiments performed with a traditional high-pressure gas target, as well as with modern ab-initio calculations employing state-of-the-art nuclear forces from chiral effective field theory. The nearly background-free measurement highlights the optimal properties of the gas-jet target for elements heavier than hydrogen, enabling new applications in hadron and nuclear physics.