Photon yields from nitrogen gas and dry air excited by electrons

Details Photon yields from nitrogen gas and dry air excited by electrons Photon yields from nitrogen gas and dry air excited by electrons

2003-03-10

arxiv.org/abs/astro-ph/0303193v3

Astropart.Phys. 20 (2003) 293-309

Astronomy and Astrophysics

Astrophysics

28 pages, 13 figures, LaTeX with elsart.cls, accepted by Astroparticle Physics

Scientific paper

10.1016/S0927-6505(03)00192-0

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 $\beta$ 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 $^{\circ}$C. The air density and temperature dependence is given for application to UHECR observations.

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