标题： 深度非弹性轻子散射在x > 1时的核以及核子谱函数 显示英文标题

标题： Deep Inelastic Lepton Scattering in Nuclei at x > 1 and the Nucleon Spectral Function

摘要： 核结构函数 F_2A(x) 在 Bjorken 极限下对原子核的 (l, l') 散射进行了研究，在 x > 1 区域发现它对原子核中核子谱函数所包含的信息非常敏感，特别是大动量区域中的动量和能量之间的关联。 计算是在局部密度近似下进行的，使用了两种不同的核物质谱函数。 结果与针对考虑中的有限原子核 ^{16}O 直接评估的谱函数所得结果进行了比较。 对于 x 接近 1.5 及更大的值，准粒子贡献可以忽略不计，这突显了当前反应对超出壳模型方法的核动力学性质的敏感性。 分析了几种通常在 EMC 效应研究中使用的近似方法，并展示了它们在此区域的不准确性。 这些结果强调了核结构函数包含关于核动力学关联的重要信息。 因此，对该区域以及许多原子核的 F_2A(x) 进一步测量将是非常受欢迎的。 显示英文摘要

摘要： The nuclear structure function F_2A(x) has been studied in the Bjorken limit for (l, l') scattering on nuclei in the region of x > 1 and was found to be very sensitive to the information contained in the nucleon spectral function in nuclei, particularly the correlations between momenta and energies in the region of large momenta. Calculations were done in a local density approximation using two different spectral functions for nuclear matter. Results are compared to those obtained for a spectral function which has been evaluated directly for the finite nucleus, ^{16}O, under consideration. For values of x around 1.5 and larger the quasiparticle contribution is negligible, thus stressing the sensitivity of the present reaction to the dynamical properties of nuclei beyond the shell model approach. Several approximations which are usually employed in studies of the EMC effect have been analyzed and their inaccuracy in this region is demonstrated. The results stress the fact that the nuclear structure function contains important information on nuclear dynamical correlations. Therefore further measurements of F_2A(x) in that region and for many nuclei would be most welcome.