Discrimination of <italic style="font-style: italic">pp</italic> solar neutrinos and <sup>14</sup>C double pile-up events in a large-scale LS detector

Guo-Ming Chen; Xin Zhang; Ze-Yuan Yu; Si-Yuan Zhang; Yu Xu; Wen-Jie Wu; Yao-Guang Wang; Yong-Bo Huang

doi:10.1007/s41365-023-01295-z

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Discrimination of pp solar neutrinos and ¹⁴C double pile-up events in a large-scale LS detector

NUCLEAR PHYSICS AND INTERDISCIPLINARY RESEARCH | Updated：2023-10-13

- Discrimination of pp solar neutrinos and ¹⁴C double pile-up events in a large-scale LS detector
- Nuclear Science and Techniques Vol. 34, Issue 9, Article number: 137(2023)
- Affiliations：
  
  1.School of Physical Science and Technology, Guangxi University, Nanning 530004, China
  2.Institute of High Energy Physics, Beijing 100049, China
  3.University of Chinese Academy of Sciences, Beijing 100049, China
  4.School of Physics, Sun Yat-Sen University, Guangzhou 510275, China
  5.Department of Physics and Astronomy, University of California, Irvine, CA, USA
- Author bio：
  
  † huangyb@gxu.edu.cn
- Funds：
- DOI：10.1007/s41365-023-01295-z
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Guo-Ming Chen, Xin Zhang, Ze-Yuan Yu, et al. Discrimination of pp solar neutrinos and ¹⁴C double pile-up events in a large-scale LS detector. [J]. Nuclear Science and Techniques 34(9):137(2023)
DOI：

Guo-Ming Chen, Xin Zhang, Ze-Yuan Yu, et al. Discrimination of pp solar neutrinos and ¹⁴C double pile-up events in a large-scale LS detector. [J]. Nuclear Science and Techniques 34(9):137(2023) DOI： 10.1007/s41365-023-01295-z.

摘要

Abstract

As a unique probe, the precision measurement of ,pp, solar neutrinos is important for studying the sun’s energy mechanism as it enables monitoring the thermodynamic equilibrium and studying neutrino oscillations in the vacuum-dominated region. For a large-scale liquid scintillator detector, a bottleneck for ,pp, solar neutrino detection is the pile-up events of intrinsic ,14,C decay. This paper presents a few approaches to discriminating between ,pp, solar neutrinos and ,14,C pile-up events by considering the differences in their time and spatial distributions. In this study, a Geant4-based Monte Carlo simulation is conducted. Multivariate analysis and deep learning technology are adopted to investigate the capability of ,14,C pile-up reduction. The BDTG (boosted decision trees with gradient boosting) model and VGG network demonstrate good performance in discriminating ,pp, solar neutrinos and ,14,C double-pile-up events. Under the ,14,C concentration assumption of 5×10,-18, g/g, the signal significance can achieve 10.3 and 15.6 using the statistics of only one day. In this case, the signal efficiency for discrimination using the BDTG model while rejecting 99.18% ,14,C double pile-up events is 51.1%, and that for the case where the VGG network is used while rejecting 99.81% of the ,14,C double pile-up events is 42.7%.

关键词

Keywords

Liquid scintillator detectorpp solar neutrinos14C pile-upMultivariate analysisDeep learning

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⁰

Discrimination of pp solar neutrinos and 14C double pile-up events in a large-scale LS detector

DOI：10.1007/s41365-023-01295-z

摘要

Abstract

关键词

Keywords

references

Discrimination of pp solar neutrinos and ¹⁴C double pile-up events in a large-scale LS detector