Measurement of the photon detection inefficiency of electromagnetic calorimeters at energies below 1 GeV
Journal
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Journal Volume
552
Journal Issue
3
Pages
263-275
Date Issued
2005
Author(s)
Ajimura, S.
Abstract
The photon detection inefficiency of electromagnetic calorimeters due to photonuclear reactions has been studied at photon energies below 1 GeV using a tagged-photon beam at the KEK-Tanashi 1.3-GeV electron synchrotron. Photonuclear reactions are identified by detecting low-energy neutrons with liquid scintillation counters surrounding the sample calorimeter. For a Cesium Iodide (CsI) calorimeter with a detection threshold of 10 MeV, the inefficiency due to photonuclear reactions is 10-4 at Eγ=100MeV, and decreases to 2×10-7 at Eγ=1GeV. For a lead-scintillator sampling calorimeter, the inefficiency is larger than the above values by a factor of 2-3, reflecting the sampling effect after photonuclear reactions. By decreasing the detection threshold down to 1 MeV, the inefficiencies are reduced by a factor of 10 for both types of calorimeters. © 2005 Elsevier B.V. All rights reserved.
Subjects
Electromagnetic calorimeter; Photon detection inefficiency K L0→π0νν̄ decay
SDGs
Other Subjects
Calorimeters; Electromagnetic fields; Neutrons; Scintillation; Synchrotrons; Electromagnetic calorimeters; Lead-scintillators; Low-energy neutrons; Photon detection inefficiency K decay; Photons
Type
journal article