反中微子碳氢化合物反应的中子测量
Neutron measurements from anti-neutrino hydrocarbon reactions
摘要：
利用MINERvA探测器中碳氢闪烁体上的荷电反中微子相互作用研究其末态中子的活度。为了确保大多数中子来自主相互作用，而不是探测器中的强子再相互作用，样品被限制在低于0.8 GeV/c的动量转移。在16,129个相互作用中，观察到15,246个中性粒子候选者。参考模拟预测这些候选者中有64%是直接来自反中微子相互作用的中子，但总体上也高估了15%的候选者数量，这超出了中微子相互作用和中子在探测器中传播模型的标准不确定性估计。使用测量的能量沉积，飞行时间，位置和速度的分布，我们探讨了模型的这两个方面的细节的敏感性。我们还使用多重性分布来评估一个两个核子敲除过程的存在。这些结果为完整描述中微子相互作用的强子末态提供了重要的新信息，这对中微子振荡实验至关重要。
英文摘要：
Charged-current anti-neutrino interactions on hydrocarbon scintillator in the MINERvA detector are used to study activity from their final-state neutrons. To ensure that most of the neutrons are from the primary interaction, rather than hadronic reinteractions in the detector, the sample is limited to momentum transfers below 0.8 GeV/c. From 16,129 interactions, 15,246 neutral particle candidates are observed. The reference simulation predicts 64\% of these candidates are due to neutrons from the anti-neutrino interaction directly, but also overpredicts the number of candidates by 15\% overall, which is beyond the standard uncertainty estimates for models of neutrino interactions and neutron propagation in the detector. Using the measured distributions for energy deposition, time of flight, position, and speed, we explore the sensitivity to the details those two aspects of the models. We also use multiplicity distributions to evaluate the presence of a two-nucleon knockout process. These results provide critical new information toward a complete description of the hadronic final state of neutrino interactions, which is vital to neutrino oscillation experiments.
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