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arXiv 1106.4458physics.ins-detnucl-ex
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6Li-液体Scintillator快中子探测

Fast Neutron Detection with 6Li-loaded Liquid Scintillator

B. M. Fisher, J. N. Abdurashitov, K. J. Coakley, V. N. Gavrin, D. M. Gilliam, J. S. Nico, A. A. Shikhin, A. K. Thompson, D. F. Vecchia, V. E. Yants

摘要:

我们报告了一个快中子探测器的发展,使用的液体闪烁体掺杂与丰富的Li-6。锂以具有基于二异丙基萘的液体闪烁体的水性LiCl微乳液的形式引入。获得0.15重量%的Li-6浓度。将闪烁体填充到125 mL玻璃池中,并用裂变源中子进行辐照。快中子可以在闪烁体中产生反冲质子,并且在检测器体积内热化的那些中子可以在Li-6上被捕获。中子的能量可以通过反冲质子的光输出来确定,并且延迟热中子的捕获减少了背景事件。在本文中,我们讨论了这种6Li液体闪烁体的发展,演示了它在探测器中的操作,并比较其效率和捕获寿命与蒙特卡罗模拟。从一个硼负载的塑料闪烁体的数据进行了比较。我们还提出了一个脉冲形状的歧视方法区分电子和核反冲事件的基础上的Matusita距离之间的归一化观测波形和核和电子反冲模板波形。测量的细节进行了讨论,以及具体的数据分析和比较与蒙特卡罗模拟。

英文摘要:

We report on the development of a fast neutron detector using a liquid scintillator doped with enriched Li-6. The lithium was introduced in the form of an aqueous LiCl micro-emulsion with a di-isopropylnaphthalene-based liquid scintillator. A Li-6 concentration of 0.15 % by weight was obtained. A 125 mL glass cell was filled with the scintillator and irradiated with fission-source neutrons. Fast neutrons may produce recoil protons in the scintillator, and those neutrons that thermalize within the detector volume can be captured on the Li-6. The energy of the neutron may be determined by the light output from recoiling protons, and the capture of the delayed thermal neutron reduces background events. In this paper, we discuss the development of this 6Li-loaded liquid scintillator, demonstrate the operation of it in a detector, and compare its efficiency and capture lifetime with Monte Carlo simulations. Data from a boron-loaded plastic scintillator were acquired for comparison. We also present a pulse-shape discrimination method for differentiating between electronic and nuclear recoil events based on the Matusita distance between a normalized observed waveform and nuclear and electronic recoil template waveforms. The details of the measurements are discussed along with specifics of the data analysis and its comparison with the Monte Carlo simulation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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