Performance study of single undoped CsI crystals for the Mu2e experiment

Donghia, R. (2016) Performance study of single undoped CsI crystals for the Mu2e experiment. Il nuovo cimento C, 39 (2). pp. 1-10. ISSN 1826-9885

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The Mu2e experiment at Fermilab aims to measure the neutrinoless muon-to-electron conversion, which is a charged-lepton flavor-violating process. The goal of the experiment is to reach a single event sensitivity of 2.5 × 10−17, to set an upper limit on the muon conversion rate at 6.7 × 10−17 in a three-year run. For this purpose, the Mu2e detector is designed to identify electrons from muon conversion and reduce the background to a negligible level. It consists of a low-mass straw tracker and a pure CsI crystal calorimeter. In this paper, the performance of undoped CsI single crystal is reported. Crystals from many vendors have been characterized by determining their Light Yield (LY) and Longitudinal Response Uniformity (LRU), when read with a UV extended PMT, and their time resolution when coupled to a silicon photomultiplier. The crystals show a LY of ∼ 100 photoelectrons per MeV when wrapped with Tyvek and coupled to the PMT without optical grease. The LRU is well represented by a linear slope that is on average 0.6%/cm. Both measurements have been performed using a 22Na source. The timing performance has been evaluated exploiting cosmic rays, with MPPC readout. A timing resolution lower than 400 ps has been achieved (at ∼ 20 MeV, which is the energy released by a minimum ionizing particle in the crystal).

Item Type: Article
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 29 Sep 2020 15:50
Last Modified: 29 Sep 2020 15:50

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