Coincidence-based reconstruction for reactor antineutrino detection in gadolinium-doped Cherenkov detectors
Coincidence-based reconstruction for reactor antineutrino detection in gadolinium-doped Cherenkov detectors
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DOI：
10.1016/j.nima.2023.168375
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发表时间：
2022-10
期刊：
影响因子：
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通讯作者：
L. Kneale;M. Smy;M. Malek
中科院分区：
文献类型：
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作者：
L. Kneale;M. Smy;M. Malek
一种重建算法已经被开发出来，以利用切伦科夫技术的进步来探测反应堆反中微子。大型Gd-H2O切伦科夫探测器是一项正在发展中的技术，它利用Gd负载来增加在逆β衰变(IBD)相互作用中产生的中子的能见度，这些相互作用产生在时间和空间上一致的正电子-中子对。在本文中，我们描述了利用IBD对中两个事件的组合光来准确重建相互作用的顶点的重建方法。通过模拟，该算法已应用于Gd-H2O和Gd掺杂水基液体闪烁体(Gd-WBLS)中反应堆反中微子的重建，Gd-WBLS是一种先进的探测介质，目前也在开发中。与单粒子重建相比，联合重建在最低能量下将反应堆IBD正电子的顶点分辨率提高了4.5倍。IBD-中子点分辨率在大多数情况下提高了30%以上。强大的背景抑制与重合重建可以通过需要最低质量的拟合来实现。这被发现拒绝了高达94%的不相关背景事件的意外重合，同时保留了至少97.5%的IBD信号对。
A reconstruction algorithm has been developed to capitalize on advances in Cherenkov technology for reactor antineutrino detection. Large gadolinium-doped water (Gd-H 2 O) Cherenkov detectors are a developing technology which use Gd loading to increase the visibility of the neutrons produced in inverse beta decay (IBD) interactions, which produce positron–neutron pairs coincident in time and space. In this paper, we describe the reconstruction which uses the combined light from both events in an IBD pair to accurately reconstruct the interaction vertex. Using simulation, the algorithm has been applied to the reconstruction of reactor antineutrinos in Gd-H 2 O and in Gd-doped water-based liquid scintillator (Gd-WbLS), an advanced detector medium which is also currently in development. Compared to a single-event reconstruction, the combined reconstruction improves vertex resolution for reactor IBD positrons by up to a factor of 4.5 at the lowest energies. IBD-neutron vertex resolution was found to improve by more than 30% in most instances. Powerful background rejection with the coincidence reconstruction can be achieved by requiring a minimum quality of fit. This was found to reject up to 94% of accidental coincidences of uncorrelated background events, while retaining at least 97.5% of the IBD signal pairs.