发表机构
École polytechnique, IN2P3-CNRS; Department of Physics and Astronomy, Ghent University; Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla; Department of Physics, University of Washington（巴黎综合理工学院，法国国家科学研究中心; 根特大学物理与天文系; 塞维利亚大学原子、分子与核物理系; 华盛顿大学物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究针对 inclusive 电子-原子核散射，基于独立粒子模型结合SRCs、MECs，计算了¹²C在准弹性和dip区的核响应，揭示了SRCs和MECs对响应的影响及横向强度过剩的来源。
AI 中文摘要
纵向和横向核响应函数编码了 inclusive 电子-原子核散射中探测到的核靶的电磁行为信息。我们提出了一种基于独立粒子模型的微观计算方法，其中非相对论核平均场势支配着相互作用的初始和末态强子态。我们加入了动态生成的短程核子-核子关联（SRCs），以及来自单π介子交换和中间Δ共振激发的介子交换电流（MECs）。我们评估了¹²C的 inclusive 电子散射中，一体和两核子敲出反应对核响应的贡献，涵盖准弹性区和 dip 区。我们证明，在准弹性运动学下，SRCs 会使两种核响应都减弱，而 MECs 会增强横向信号，大幅改善预测的横向-纵向比值。在准弹性峰与Δ共振峰之间的 dip 区，我们发现观测到的横向强度过剩主要源于Δ共振激发后的明确两核子敲出。
英文摘要
The longitudinal and transverse nuclear response functions encode information about the electromagnetic behavior of the nuclear target probed in inclusive electron-nucleus scattering. We present a microscopic calculation based on an independent-particle model, where a non-relativistic nuclear mean-field potential governs both the initial and final hadronic states of the interaction. We add dynamically generated short-range nucleon-nucleon correlations (SRCs), as well as meson-exchange currents (MECs) derived from one-pion exchange and intermediate $Δ$-resonance excitation. We evaluate the contributions from one- and two-nucleon knock-out reactions to nuclear responses in inclusive electron scattering from $^{12}\mathrm{C}$ in the quasielastic and dip regions. We demonstrate that for quasielastic kinematics, SRCs quench both nuclear responses, while the MECs enhance the transverse signal, substantially improving the predicted transverse-to-longitudinal ratio. In the dip region between the quasielastic and the $Δ$-resonance peaks, we find that the observed excess of transverse strength originates mainly from explicit two-nucleon knock-out following a $Δ$-resonance excitation.
Comments23 pages, 19 figures
