Title: Development and performance evaluation of a water-based liquid scintillator tracking detector with wavelength-shifting fiber readout Show Chinese title

Title: 基于水的液体闪烁体追踪探测器与波长移位光纤读出的开发与性能评估

Abstract: We have developed a novel tracking detector utilizing a water-based liquid scintillator (WbLS) for the accurate characterization of neutrino interactions on a water target. In this detector, the WbLS is optically segmented into small cells by reflective separators, and the scintillation light is read out in three directions using wavelength-shifting fibers coupled to silicon photomultipliers. We developed and optimized WbLS samples for this application and measured their light yield using cosmic-ray muons. Subsequently, we constructed a prototype of the WbLS tracking detector and evaluated its performance with a positron beam. The beam test demonstrated good tracking performance, although the light yield was lower than required. The result prompted a review of the surfactant used in the WbLS and the material of the optical separators, leading to a significant improvement in light yield. In this paper, we report on a design of the WbLS tracking detector, the development of the WbLS, the results of the beam test, and subsequent improvements to the WbLS and optical separators. Show Chinese abstract

Abstract: 我们开发了一种新型跟踪探测器，利用基于水的液态闪烁体（WbLS）对水靶上的中微子相互作用进行准确表征。 在此探测器中，WbLS通过反射性分隔器光学分割成小单元，并使用与硅光电倍增管耦合的波长转移光纤在三个方向读出闪烁光。 我们为此应用开发并优化了WbLS样品，并使用宇宙线μ子测量了它们的光产率。 随后，我们构建了WbLS跟踪探测器的原型，并用正电子束对其性能进行了评估。 束流测试显示了良好的跟踪性能，尽管光产率低于要求。 这一结果促使我们重新审查WbLS中使用的表面活性剂和光学分隔器的材料，从而显著提高了光产率。 本文报告了WbLS跟踪探测器的设计、WbLS的开发、束流测试的结果以及随后对WbLS和光学分隔器的改进。