arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.13266physics.ins-dethep-ex
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地下掺钆水探测器测量岩石中μ子感生高能中子

Measurement of Muon-induced High-energy Neutrons from Rock in an Underground Gd-doped Water Detector

F. Sutanto, O. A. Akindele, M. Askins, M. Bergevin, A. Bernstein, N. S. Bowden, S. Dazeley, P. Jaffke, I. Jovanovic, S. Quillin, C. Roecker, S. D. Rountree

摘要:

我们提出了一个测量的相关中子捕获率的手表男孩探测器,部署在深度约390米水当量(m.w.e.)。Kimballton Underground Research Facility(KURF)WATCHBOY由一个2吨重的圆柱形水靶组成,其中掺杂了0.1%的钆,周围有一个40吨重的无掺杂水密封屏蔽层。我们提出了一个比较我们的结果与预期的相关中子捕获率所产生的高能中子入射在外面的手表屏蔽,预测的混合FLUKA/GEANT 4为基础的模拟。模拟中使用的入射中子能量分布是由快中子谱仪,1.8吨多重和反冲谱仪(MARS)探测器,在同一深度测量的。我们发现,测量的两个相关的中子的探测率是一致的模拟预测。这一结果为MARS使用的探测技术提供了额外的信心,因此也为在三个不同深度测量的MARS光谱提供了信心。快中子通量和能谱的确认是重要的,因为它有助于验证用于预测不同覆盖层下快中子通量的标度模型。

英文摘要:

We present a measurement of the rate of correlated neutron captures in the WATCHBOY detector, deployed at a depth of approximately 390 meters water equivalent (m.w.e.) in the Kimballton Underground Research Facility (KURF). WATCHBOY consists of a cylindrical 2 ton water target doped with 0.1% gadolinium, surrounded by a 40 ton undoped water hermetic shield. We present a comparison of our results with the expected rate of correlated neutron captures arising from high-energy neutrons incident on the outside of the WATCHBOY shield, predicted by a hybrid FLUKA/GEANT4-based simulation. The incident neutron energy distribution used in the simulation was measured by a fast neutron spectrometer, the 1.8-ton Multiplicity and Recoil Spectrometer (MARS) detector, at the same depth. We find that the measured detection rate of two correlated neutrons is consistent with that predicted by simulation. The result lends additional confidence in the detection technique used by MARS, and therefore in the MARS spectra as measured at three different depths. Confirmation of the fast neutron flux and spectrum is important as it helps validate the scaling models used to predict the fast neutron fluxes at different overburdens.

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