Upgrade of LXe gamma-ray detector in MEG experiment

Nuclear physics. B, Proceedings, supplements Pub Date : 2014-08-01 DOI:10.1016/j.nuclphysbps.2014.09.055

Daisuke Kaneko, MEG collaboration

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Abstract

We are searching for the $μ \to e + γ$ in the MEG experiment. In order to improve the search sensitivity down to about 5 × 10⁻¹⁴, which is one order higher than the sensitivity goal of the current stage of the experiment. We are planning a major upgrade of the experiment including the upgrade of the liquid xenon (LXe) γ-ray detector. The main item of the upgrade of the xenon detector is a replacement of the current PMTs located on the γ-ray incident face with smaller photosensors such as MPPC. The energy and position resolutions are expected to be significantly improved, especially for the event where γ-ray converts at a shallow point in the LXe. Because the MPPC operational in liquid xenon is not yet commercially available, we are developing special MPPC in collaboration with Hamamatsu Photonics. The detection efficiency for LXe scintillation light is measured with prototype sensors and found to be already at the level necessary for the upgrade of the experiment.

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MEG实验中LXe射线探测器的升级

我们正在MEG实验中寻找μ→e+γ。为了将搜索灵敏度提高到5 × 10−14左右，比现阶段实验的灵敏度目标高一个数量级。我们正在计划对实验进行重大升级，包括升级液态氙(LXe) γ射线探测器。氙气探测器升级的主要项目是用更小的光电传感器(如MPPC)取代目前位于γ射线入射面上的pmt。预计能量和位置分辨率将显著提高，特别是对于γ射线在LXe中较浅点转换的事件。由于在液态氙中运行的MPPC尚未商业化，我们正在与滨松光电公司合作开发特殊的MPPC。用原型传感器测量了LXe闪烁光的探测效率，发现LXe闪烁光的探测效率已经达到了实验升级所需要的水平。

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Nuclear physics. B, Proceedings, supplements

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