论文标题
Taishan抗神经天文台的环境中子测量
Ambient Neutron Measurement at Taishan Antineutrino Observatory
论文作者
论文摘要
Taishan抗神经天文台（TAO）是吨位液体闪烁体检测器，位于30 \中，从Taishan核电站的核心置于M的核心，用于精确的反应堆抗神经光谱测量值。道物理学的一个重要背景是环境中子可以穿透其外部屏蔽的相互作用。中子的频率和能量光谱是通过Bonner球形光谱仪测量的。数据通过迭代最大可能期望最大化（MLEM）方法展开数据。进行基于GEANT4的仿真，以向展开的初始输入频谱提供并理解未折叠的结果。总中子通量率为36.1 $ \ pm $ 4.7 $ hz/m^2 $，高于预期。对于低于20 \的中子，MEV的中子可以通过模拟很好地再现了测得的通量率和能量谱。虽然对于大于20 \的地区，但观察到很大的差异，应通过进一步的研究来理解。
The Taishan Antineutrino Observatory (TAO) is a ton-level liquid scintillator detector to be placed at 30\,m from a core of the Taishan Nuclear Power Plant for precise reactor antineutrino spectrum measurements. One important background for TAO physics are the interactions of ambient neutrons that can penetrate its outer shieldings. The neutrons fluence and energy spectrum are measured with a Bonner sphere spectrometer. Data is unfolded with the iterative Maximum-Likelihood Expectation-Maximization (MLEM) method. A simulation based on Geant4 is performed to provide the initial input spectrum to the unfolding and to understand the unfolded result. The total neutron fluence rate is measured to be 36.1 $\pm$ 4.7 $Hz/m^2$, which is higher than the expectation. For neutrons with kinetic energy lower than 20\,MeV, the measured fluence rate and energy spectrum can be well reproduced by simulation. While for the region greater than 20\,MeV, a significant discrepancy is observed and shall be understood with further studies.
