Photon yields from nitrogen gas and dry air excited by electrons
arXiv:astro-ph/0303193 · doi:10.1016/S0927-6505(03)00192-0
Abstract
In order to detect ultrahigh-energy cosmic rays (UHECR), atmospheric fluorescence light from the trajectory of the extensive air shower may be measured by mirror-photosensor systems. In this type of experiment the photon yield from electrons exciting air of various densities and temperatures is most fundamental information for estimating the primary energy of UHECR. An experiment has been undertaken using a Sr90 source to study the pressure dependence of photon yields, and the life times of the excited states, for radiation in nitrogen and dry air. The photon yield between 300 nm and 406 nm in air excited by 0.85 MeV electrons is 3.73+-0.15 (+-14% systematic) photons per meter at 1000 hPa and 20 C. The air density and temperature dependence is given for application to UHECR observations.
arXiv comment28 pages, 13 figures, LaTeX with elsart.cls, accepted by Astroparticle Physics
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