Title :
High precision measurement of positron time in MEG upgrade
Author :
Uchiyama, Yusuke
Author_Institution :
ICEPP, Univ. of Tokyo, Tokyo, Japan
fDate :
Oct. 27 2013-Nov. 2 2013
Abstract :
We present a development of scintillation counter system for a precise time measurement in the MEG II experiment searching for the lepton-flavor-violating decay, μ+ → e+γ. It consists of several hundreds of plastic scintillation counters each of which is read out by several silicon-photomultipliers (SiPM). To pursue the ultimate resolution of a single counter, we have studied and optimized types of SiPM and the way of connection, resulting in a single counter resolution of 40 ps. As a whole system, we achieve 30 ps resolution by combining several counter measurements. The resolution was demonstrated in a beam test.
Keywords :
photomultipliers; silicon radiation detectors; solid scintillation detectors; time measurement; MEG II experiment searching; MEG upgrade; beam test; counter measurements; high precise time measurement; lepton-flavor-violating decay; muon+ decay into positron+gamma; plastic scintillation counters; positron time; scintillation counter system; silicon-photomultipliers; single-counter resolution; Detectors; Positrons; Radiation detectors; Signal resolution; Timing;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2013 IEEE
Conference_Location :
Seoul
Print_ISBN :
978-1-4799-0533-1
DOI :
10.1109/NSSMIC.2013.6829428
