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A Cherenkov imager for charge measurements of Nuclear Cosmic Rays in the CREAM II instrument

Buénerd, M. / Barrau, A. / Bazer-Bachi, R. / Borrel, V. / Bourrion, O. / Bouvier, J. / Boyer, B. / Derome, L. / Eraud, L. / Foglio, R. / Gallin-Martel, L. / Ganel, O. / Lee, M.H. / Lutz, L. / Malinine, A. / Mangin-Brinet, M. / Marcowith, A. / Menchaca-Rocha, A. / Périé, J.N. / Protasov, K. / Sallaz-Damaz, Y. / Seo, E.S. / Zinn, S.Y. - 2005
A proximity focusing Cherenkov imager for the charge measurement of nuclear cosmic rays in the CREAM II instrument, called CHERCAM, is under construction. This imager consists of a silica aerogel radiator plane facing a detector plane equipped with standard photomultipliers. The two planes are separated by a minimal ring expansion gap. The Cherenkov light yield is proportional to the squared charge of the detected particle. The expected relative light collection accuracy is in the few percents range. It should lead to single element separation over the range of nuclear charge Z of main interest 1 $leq$ Z $<$\approx$ 26.

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