Performances of the aerogel threshold Cherenkov counter for the Jefferson Lab Hall A spectrometers in the 1-4 GeV/c momentum range

The silica aerogel threshold Cherenkov counter for the Jefferson Lab Hall A spectrometer was tested at CERN with a mixed beam of positrons, pions, and protons in the 1-4 GeV/c momentum range. Aerogel from Airglass, Sweden, with a refractive index of 1.025 was used. For this momentum range and refrac...

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Detalles Bibliográficos
Autores principales: Perrino, R, Lagamba, L, Cisbani, E, Colilli, S, Crateri, R, De Leo, R, Frullani, S, Garibaldi, F, Giuliani, F, Gricia, M, Iodice, M, Iommi, R, Leone, A, Lucentini, M, Mostarda, A, Nappi, E, Pierangeli, L, Santavenere, F, Urciuoli, G M
Lenguaje:eng
Publicado: 2001
Materias:
Detectors and Experimental Techniques
Acceso en línea:https://dx.doi.org/10.1016/S0168-9002(00)00784-1
http://cds.cern.ch/record/503753
Descripción
Sumario:The silica aerogel threshold Cherenkov counter for the Jefferson Lab Hall A spectrometer was tested at CERN with a mixed beam of positrons, pions, and protons in the 1-4 GeV/c momentum range. Aerogel from Airglass, Sweden, with a refractive index of 1.025 was used. For this momentum range and refractive index only positrons and pions are above the Cherenkov threshold. Detection efficiencies of 96% for pions and of 98% for positrons were measured. A 5% fake proton detection was also measured, mostly caused by induced delta - rays and accidentals generated by high counting rates. (8 refs).

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