Title :
Performance of a 4-7GeV/c Kaon Identification System in KEK-PS E248
Author :
Tajima, Yasuhisa ; Kawai, Hideyuki ; Nakayama, Hirofumi ; Takamatsu, Kunio ; Tsuru, Tsuneaki ; Yoshida, Hiroshi
Author_Institution :
Networking & Comput. Service Center, Yamagata Univ.
fDate :
Oct. 29 2006-Nov. 1 2006
Abstract :
A kaon identification system with momentum range of 4-7GeV/c was used in KEK-PS E248 experiment. The system consisted of two Cherenkov counters. The radiator of the first counter was silica aerogel with the refractive index of 1.007. The counter had six stages and it was used for K/p identification. The radiator of the second counter was SF6 gas (n= 1.0007). The second counter had two stages and it was used for pi/K identification. Performance of two counters was estimated with using the pions and protons, identified by a TOF system. As for the first counter, typical efficiency of each stage was 49.2% for pions and a typical fake rate of proton was 5%. In case that the number of hit stages ges4, 99.8% of protons were rejected and 50% of pions and kaons were selected. As for the second counter, typical efficiency of each stage was 97.9% for high momentum (>5GeV/c) pions and a typical fake rate of proton was 3%. In case that both stages were no hit, 98.7% of pions were rejected and 97.9% of high momentum kaons and protons were selected. The total system gave rejection efficiency of 98.7% for pions and protons, and 31.5% of kaons were selected.
Keywords :
Cherenkov counters; kaons; meson detection; Cherenkov counters; KEK-PS E248; SF6; SiO2; kaon identification system; pion rejection; proton rejection; silica aerogel; Counting circuits; Electronic mail; Hydrogen; Mesons; Nuclear and plasma sciences; Protons; Radiation detectors; Refractive index; Silicon compounds; Sulfur hexafluoride; Aerogel; Cherenkov counters; Particle identification;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2006. IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
1-4244-0560-2
Electronic_ISBN :
1095-7863
DOI :
10.1109/NSSMIC.2006.356189