标题： 统一电弱理论中轻核的电子散射截面 显示英文标题

标题： Electron scattering cross section for light nuclei within the unified electroweak theory

摘要： 我们在统一的电弱理论中采用多极展开，发展了一种计算轻核电子散射截面的完整方法。 对6、7Li和7Be核的具体计算表明，传统冲量近似法只能在入射电子能量不超过核子质量两倍时应用于电子-核子散射。 此外，7Li从基态跃迁到最近激发态的准弹性散射截面和基态的弹性散射截面分别处理，而实验中尚未对这两者单独测量。 通过适当调整谐振子参数以及V-A结构所获得的散射截面，在兆电子伏特能量下合理地解释了现有的实验数据，并在千兆电子伏特能量下提供了预测信息。 这为研究核结构和弱相互作用提供了新的视角，通过高（千兆电子伏特）能量下的电子或轻子散射来研究核而非夸克。 显示英文摘要

摘要： We employ the multipole expansion within the unified electroweak theory to develop a complete calculation method of the electron scattering cross section for light nuclei. The specific calculations for 6,7Li and 7Be nuclei indicate that the conventional impulse approximation can be applied to the electron-nucleus scattering only when the incident electron energy does not exceed twice the nucleon mass. In addition, the quasi-elastic scattering cross section of 7Li in the excitation from its ground state to the nearest excited state and that of elastic scattering in the ground state are independently treated, whereas they have not been separately measured in experiments. The obtained scattering cross sections corresponding to an appropriate adjustment of the harmonic oscillator parameter along with the V-A structure interpret reasonably well the available experimental data at MeV energies and provide predictive information at GeV energies. This gives new perspectives in studying the structure of nuclei and the weak interactions via electron or lepton scattering at high (GeV) energies, considering nuclei rather than quarks.