arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1803.08802physics.ins-det
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未分段的大体积液体scintillator探测器中的拓扑径迹重建

Topological track reconstruction in unsegmented, large-volume liquid scintillator detectors

Björn S. Wonsak, Caren I. Hagner, Dominikus A. Hellgartner, Kai Loo, Sebastian Lorenz, David J. Meyhöfer, Lothar Oberauer, Henning Rebber, Wladyslaw H. Trzaska, Michael Wurm

摘要:

非分段式、大体积液体闪烁体中微子探测器是低能中微子物理研究的关键技术。有效地抑制宇宙μ子相互作用引起的放射性核素本底对于它们在高精度MeV中微子测量中的成功至关重要。我们提出了一种新的技术来重建GeV粒子轨道LS,其主要属性,分辨率的拓扑特征和变化的微分能量损失$\mathrm{d}E/\mathrm{d}x$,允许改进的拒绝策略。不同于常见的轨道重建方法,我们的方法不依赖于具体的轨道/拓扑假设。相反,基于空间和时间中的参考点、在光电传感器处观察到的光子到达时间的分布以及在光子产生、传播和检测(光学模型)方面的检测器的特性,其重建光学光子发射的体素化分布。然后可以应用来自三维数据分析的技术来提取描述拓扑的参数,轨道的方向。我们进行了我们的方法使用单μ子事件高达$10\,\mathrm{GeV}$从Geant 4模拟的LENA探测器的第一次性能评估。目前的结果表明,我们的方法与现有的重建方法是有竞争力的-虽然它的全部潜力尚未被利用。我们还评论其他探测器技术在天体粒子物理学以及在医学成像中的应用,可以受益于我们的方法的基本思想。

英文摘要:

Unsegmented, large-volume liquid scintillator (LS) neutrino detectors have proven to be a key technology for low-energy neutrino physics. The efficient rejection of radionuclide background induced by cosmic muon interactions is of paramount importance for their success in high-precision MeV neutrino measurements. We present a novel technique to reconstruct GeV particle tracks in LS, whose main property, the resolution of topological features and changes in the differential energy loss $\mathrm{d}E/\mathrm{d}x$, allows for improved rejection strategies. Different to common track reconstruction approaches, our method does not rely on concrete track / topology hypotheses. Instead, based on a reference point in space and time, the observed distribution of photon arrival times at the photosensors and the detector's characteristics in terms of photon production, propagation and detection (optical model), it reconstructs the voxelized distribution of optical photon emissions. Techniques from three-dimensional data analysis can then be applied to extract parameters describing the topology, e.g., the direction of a track. We performed a first performance evaluation of our method using single muon events with up to $10\,\mathrm{GeV}$ from a Geant4 simulation of the LENA detector. The current results indicate that our approach is competitive with existing reconstruction methods -- although its full potential has not yet been exploited. We also remark on other detector technologies in astroparticle physics as well as applications in medical imaging that could benefit from the fundamental ideas of our method.

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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