Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA.
Department of Physics, Hampton University, Hampton, Virginia 23668, USA.
Phys Rev Lett. 2014 Jun 13;112(23):231801. doi: 10.1103/PhysRevLett.112.231801. Epub 2014 Jun 9.
We present measurements of ν(μ) charged-current cross section ratios on carbon, iron, and lead relative to a scintillator (CH) using the fine-grained MINERvA detector exposed to the NuMI neutrino beam at Fermilab. The measurements utilize events of energies 2<E(ν)<20 GeV, with ⟨E(ν)⟩ = 8 GeV, which have a reconstructed μ(-) scattering angle less than 17° to extract ratios of inclusive total cross sections as a function of neutrino energy E(ν) and flux-integrated differential cross sections with respect to the Bjorken scaling variable x. These results provide the first high-statistics direct measurements of nuclear effects in neutrino scattering using different targets in the same neutrino beam. Measured cross section ratios exhibit a relative depletion at low x and enhancement at large x. Both become more pronounced as the nucleon number of the target nucleus increases. The data are not reproduced by GENIE, a conventional neutrino-nucleus scattering simulation, or by the alternative models for the nuclear dependence of inelastic scattering that are considered.
我们展示了使用 MINERvA 探测器在费米实验室的 NuMI 中微子束下对碳、铁和铅相对于闪烁体（CH）的 ν(μ)带电电流截面比的测量结果。这些测量利用能量为 2<E(ν)<20GeV 的事件，平均中微子能量为 ⟨E(ν)⟩ = 8GeV，其重建的 μ(-)散射角小于 17°，以提取作为中微子能量 E(ν)和相对于 Bjorken 标度变量 x 的通量积分微分截面函数的总截面比。这些结果提供了首次使用相同中微子束中不同靶标进行中微子散射的核效应的高统计量直接测量。测量的截面比在低 x 处表现出相对的耗尽，在大 x 处表现出增强。随着靶核的质子数增加，这两种情况变得更加明显。数据不被 GENIE（一种传统的中微子-核散射模拟）或所考虑的替代模型所再现，这些模型用于研究非弹性散射的核依赖性。
