DocumentCode :
58058
Title :
The CANDLES Trigger System for the Study of Double Beta Decay of ^{48}{\\rm Ca}
Author :
Maeda, T. ; Ajimura, S. ; Chan, W.M. ; Fushimi, K. ; Hazama, R. ; Ichimura, K. ; Iida, T. ; Inukai, Y. ; Ishikawa, T. ; Kakubata, H. ; Kishimoto, T. ; Matsuoka, K. ; Nakajima, K. ; Nakatani, N. ; Nomachi, M. ; Ogawa, I. ; Ohata, T. ; Ohsumi, H. ; Saka, M.
Author_Institution :
Grad. Sch. of Sci., Osaka Univ., Toyonaka, Japan
Volume :
62
Issue :
3
fYear :
2015
fDate :
Jun-15
Firstpage :
1128
Lastpage :
1134
Abstract :
The CANDLES experiment is a study of the double beta decay of 48Ca nuclei. The detector consists of two scintillators. One is the CaF2 crystal that acts as a source of double beta decay and a scintillator. The other is a liquid scintillator, which is used for gamma-veto. The total light collected from the liquid scintillator is on the same order of magnitude as that of the CaF2 scintillator, but the decay constant of the liquid scintillator is one or more orders of magnitude shorter than that of the CaF2 scintillator. Therefore, if we trigger the signal by pulse height, the energy threshold of the liquid scintillator light will be one or more orders of magnitude lower than that of the CaF2 scintillator. A high counting rate in the liquid scintillator causes deadtime; in order to avoid this problem, we have developed a new trigger system. In this paper, we describe the use of this trigger system in the CANDLES experiment and its performance after installation in 2013.
Keywords :
double beta decay; field programmable gate arrays; liquid scintillation detectors; nuclei with mass number 39 to 58; 48Ca; CANDLES trigger system; CaF2 scintillator; double beta decay; liquid scintillator; pulse height; Backplanes; Delays; Detectors; Field programmable gate arrays; Liquids; Logic gates; Monitoring; Digital signal processing; field-programmable gate arrays (FPGAs); trigger circuits;
fLanguage :
English
Journal_Title :
Nuclear Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9499
Type :
jour
DOI :
10.1109/TNS.2015.2423275
Filename :
7104181
Link To Document :
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