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Dear Yosuke Maeda,

The submission of your abstract has been successfully processed.

Abstract submitted: https://indico.cern.ch/userAbstracts.py?confId=192695.

Status of your abstract: https://indico.cern.ch/abstractDisplay.py?abstractId=137&confId=192695.

See below a detailed summary of your submitted abstract:

Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics

Submitted by: MAEDA, Yosuke

Submitted on: 31 January 2014 12:53

Title: Neutron-insensitive gamma-ray detector with aerogel for rare neutral-kaon decay experiment

Abstract content A novel gamma-ray detector which is highly sensitive to photons but insensitive to neutrons was developed for the rare neutral-kaon decay experiment (KOTO experiment) at J-PARC. This experiment aims to study the KL->pi0nunubar decay with an electromagnetic calorimeter and hermetic veto detectors placed around a neutral with high neutron and kaon rates. The veto system requires a gamma-ray detector which should be located in the beam and able to detect gammas escaping there with high efficiency even under the large neutron flux of 500MHz. This detector consists of multiple modules of lead and aerogel pair. Incident gammas are converted to electrons and positrons in lead sheets and photons from their Cerenkov radiation in aerogel are viewed by photomultiplier tubes. Since protons or charged pions, which are mainly produced by neutrons, do not emit Cerenkov lights because of their small velocity, excellent blindness to neutrons can be achieved while keeping high photon detection efficiency around 99.9% for energy larger than 1 GeV. The half number of modules of the detector were installed and actually worked as an in-beam photon veto detector in the first physics data taking of the KOTO experiment. The detector operated stably during 1 week of data taking and expected performance on gamma-ray detection was confirmed as a result of evaluation using KL->3pi0 decay events. In this presentation, the design of this detector, stability and performance studies in the physics data taking, and the future prospects will be reported.

Summary

Primary Authors: MAEDA, Yosuke (Kyoto University) maeda_y@scphys.kyoto-u.ac.jp

Co-authors:

Abstract presenters: MAEDA, Yosuke

Track classification: Sensors: 1e) Novel technologies Experiments: 2a) Experiments & Upgrades

Presentation type: --not specified--

Comments: