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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 578 (2007) 78-87
Absolute measurement of the nitrogen fluorescence yield in air between 300 and 430 nm.
G. Lefeuvre1, P. Gorodetzky1, J. Dolbeau1, T. Patzak1, P. Salin1

The nitrogen fluorescence induced in air is used to detect ultra-high energy cosmic rays and to measure their energy. The precise knowledge of the absolute fluorescence yield is the key quantity to improve the accuracy on the cosmic ray energy. The total yield has been measured in dry air using a 90Sr source and a [300-430 nm] filter. The fluorescence yield in air is 4.23 ± 0.20 photons per meter when normalized to 760 mmHg, 15°C and with an electron energy of 0.85 MeV. This result is consistent with previous experiments made at various energies, but with an accuracy improved by a factor of about 3. For the first time, the absolute continuous spectrum of nitrogen excited by 90Sr electrons has also been measured with a spectrometer. Details of this experiment are given in one of the author's PhD thesis [32].
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
APC - Neutrinos
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique
nitrogen fluorescence – air fluorescence – extensive air showers – ultra-high energy cosmic rays
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