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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Published in | Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 732; pp. 457 - 462 |
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Main Author | |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
21.12.2013
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Subjects | |
Online Access | Get full text |
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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. |
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ISSN: | 0168-9002 1872-9576 |
DOI: | 10.1016/j.nima.2013.06.008 |