Ajimura, S.S.AjimuraYEE HSIUNG et al.2019-12-302019-12-30200501689002https://scholars.lib.ntu.edu.tw/handle/123456789/443927https://www.scopus.com/inward/record.uri?eid=2-s2.0-26944460378&doi=10.1016%2fj.nima.2005.06.070&partnerID=40&md5=2b870f8282d63014c171a3261a0a9d49The 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.Electromagnetic calorimeter; Photon detection inefficiency K L0→π0νν̄ decay[SDGs]SDG7Calorimeters; Electromagnetic fields; Neutrons; Scintillation; Synchrotrons; Electromagnetic calorimeters; Lead-scintillators; Low-energy neutrons; Photon detection inefficiency K decay; Photonsjournal article10.1016/j.nima.2005.06.0702-s2.0-26944460378WOS:000233070100002https://www.scopus.com/inward/record.uri?eid=2-s2.0-26944460378&doi=10.1016%2fj.nima.2005.06.070&partnerID=40&md5=2b870f8282d63014c171a3261a0a9d49