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Measurement of air fluorescence light yield induced by an electromagnetic shower
Colin P., Chukanov A., Grebenyuk V., Naumov D., Nedelec P. et al
Astroparticle Physics 30 (2009) 312-317 - http://hal.in2p3.fr/in2p3-00147948
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique
Measurement of air fluorescence light yield induced by an electromagnetic shower
P. Colin1, A. Chukanov, V. Grebenyuk, D. Naumov, P. Nedelec1, Yu. Nefedov, A. Onofre, S. Porokhovoi, B. Sabirov, L. Tkatchev
1 :  LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules
CNRS : UMR5814 – IN2P3 – Université de Savoie
9 Chemin de Bellevue - BP 110 - 74941 Annecy-le-Vieux CEDEX - France
For most of the Ultra High Energy Cosmic Ray (UHECR) experiments and projects (HiRes, AUGER, TA, JEM-EUSO, TUS,...), the detection technique of Extensive Air Showers (EAS) is based, at least, on the measurement of the air fluorescence induced signal. The knowledge of the Fluorescence Light Yield (FLY) is of paramount importance for the UHECR energy reconstruction. The MACFLY experiment was designed to perform such FLY measurements. In this paper we will present the results of dry air FLY induced by 50 GeV electromagnetic showers as a function of shower age and as a function of the pressure. The experiment was performed at CERN using an SPS electron test beam line. It is shown that the FLY is proportional to deposited energy in air (E_d) and that the ratio FLY/E_d and its pressure dependence remain constant independently of shower age and more generally independently of the excitation source used (single electron track or air shower).

Articles dans des revues avec comité de lecture
Astroparticle Physics (Astropart. Phys.)
Publisher Elsevier
ISSN 0927-6505 

11 pages, 6 figures, submitted to astropart. phys
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