npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Research Paper

New Phys.: Sae Mulli 2019; 69: 900-904

Published online September 30, 2019

Copyright © New Physics: Sae Mulli.

Study on the Resolution Change of Reconstructed Vertex due to the Operating Status of the PMTs in Neutrino Detector

Jun Hu SEO, Zohaib ATIF, Chang Dong SHIN*, Kyung Kwang JOO, Young Seo PARK

Department of Physics, Chonnam National University, Gwangju 61186, Korea


Received: April 30, 2019; Revised: June 6, 2019; Accepted: June 17, 2019

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


The properties of neutrinos are not well known because they are weakly interacting with surrounding matter. Recently, studies on neutrinos have been actively conducted, and several results and interesting phenomena have been obtained. Various types of detectors for detecting neutrinos are used, but photomultiplier tubes (PMTs) are more generally used. In particular, a signal generated in each PMTs is used to reconstruct the position information of the neutrino incident on the detector. However, if the number of PMTs is decreased from the initial value, the performance of the PMTs and the operation efficiency may change over time, which may affect the information on the reconstructed position of the incident neutrino. This, in turn, has a direct impact on the results that utilize the reconstructed vertex information. This paper describes in brief the dependence of the resolution of the reconstructed vertex on the operating status of the PMT in the reactor neutrino detector. The Monte Carlo simulation technique was designed based on the cylindrical liquid-scintillating-detector model.

Keywords: Neutrino, Liquid scintillator, Photomultiplier tube, Vertex reconstruction, Charge weighting method

질량이 거의 없고 물질과의 상호작용을 잘 하지 않아 검출이 어려웠던 중성미자에 대한 연구가 최근에 활발히 이루어지고 있고, 중성미자에 대한 물리적인 성질들이 밝혀지고 있다. 중성미자를 검출하기 위한 검출기의 종류는 다양하지만, 신호 검출을 위해 일반적으로 광증폭관이 사용된다. 광증폭관들로부터 측정된 신호정보를 통해 입사된 중성미자의 위치 정보를 재구성할 수 있다. 그러나 시간이 지남에 따라 광증폭관들의 성능과 작동효율 등이 변하여 광증폭관들의 개수가 초기 상태와 비교해 줄어들면 재구성된 중성미자 위치 정보에 영향을 주게 된다. 이 논문에서는 원자로 중성미자와 원통형 액체섬광검출기를 기반으로 설계한 몬테카를로 시뮬레이션 기법을 활용하여 광증폭관들의 작동 상태에 따라 재구성된 중성미자의 위치 정보의 분해능 변화를 알아보았다.

Keywords: 중성미자, 액체섬광검출기, 광증폭관, 위치 재구성, 전하가중방법, 위치 분해능

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