Upgrade of the liquid xenon γ-ray detector in the MEG experiment

The MEG experiment is searching for the lepton flavor violating decay, μ+→e++γ, with the highest sensitivity. A major upgrade of the experiment is planned where the performance of the liquid xenon (LXe) γ-ray detector is expected to be significantly improved. The current 2-in. photomultiplier tubes...

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Bibliographic Details
Published inNuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 732; pp. 457 - 462
Main Author Kaneko, Daisuke
Format Journal Article
LanguageEnglish
Published Elsevier B.V 21.12.2013
Subjects
Liquid xenon
MEG experiment
MPPC (SiPM)
Liquid xenon
MEG experiment
MPPC (SiPM)
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Summary:The MEG experiment is searching for the lepton flavor violating decay, μ+→e++γ, with the highest sensitivity. A major upgrade of the experiment is planned where the performance of the liquid xenon (LXe) γ-ray detector is expected to be significantly improved. The current 2-in. photomultiplier tubes (PMT) on the γ-ray incident face will be replaced with smaller photo-sensors such as multi-pixel photon counters (MPPC) in order to improve the resolutions and the efficiency. A UV-sensitive MPPC operational in LXe is under development in collaboration with Hamamatsu Photonics. A high photon detection efficiency (PDE) of 17% to LXe scintillation light is achieved with a prototype with an active area of 12×12mm2 and a single-photoelectron peak is clearly observed. The engineering design of the detector and the development of the related technologies such as the signal transmission and assembly are also steadily in progress.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2013.06.008