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A feasibility study of extruded plastic scintillator embedding WLS fiber for AMoRE-II muon veto

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Title
A feasibility study of extruded plastic scintillator embedding WLS fiber for AMoRE-II muon veto
Author(s)
Jiwoong Seo; Eun Ju Jeon; Wootae Kim; Yeongduk Kim; Hye Young Lee; Jaison Lee; Moo Hyun Lee; P. B. Nyanda; Eung Seok Yi
Publication Date
2022-09
Journal
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, v.1039
Publisher
Elsevier B.V.
Abstract
© 2022 Elsevier B.V.AMoRE-II is the second phase of the Advanced Molybdenum-based Rare process Experiment aiming to search for the neutrino-less double beta decay of 100Mo isotopes using ∼200 kg of molybdenum-containing cryogenic detectors. The AMoRE-II needs to keep the background level below 10−5 counts/keV/kg/year with various methods to maximize the sensitivity. One of the methods is to have the experiment be carried out deep underground free from the cosmic ray backgrounds. The AMoRE-II will run at Yemilab with ∼1,000 m depth. However, even in such a deep underground environment, there are still survived cosmic muons, which can affect the measurement and should be excluded as much as possible. A muon veto detector is necessary to reject muon-induced particles coming to the inner detector where the molybdate cryogenic detectors are located. We have studied the possibility of using an extruded plastic scintillator and wavelength shifting fiber together with SiPM as a muon veto system. We found that the best configuration is two layers of plastic scintillators (PSs, 150 cm × 25 cm × 1.2 cm) with two WLS fibers per groove, which could separate radiogenic gammas well with muon detection efficiency above 99.4% along the length of the PS. Based on the expected flux from a prototype measurement at a 700 m deep underground, we found that the dead time of the muon veto system for AMoRE-II at the Yemilab with a 1 ms veto window is 0.6% of whole muon events.
URI
https://pr.ibs.re.kr/handle/8788114/12275
DOI
10.1016/j.nima.2022.167123
ISSN
0168-9002
Appears in Collections:
Center for Underground Physics(지하실험 연구단) > 1. Journal Papers (저널논문)
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