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Precise measurement of the absolute fluorescence yield of the 337 nm band in atmospheric gases

Abstract : A measurement of the absolute fluorescence yield of the 337 nm nitrogen band, relevant to ultra-high energy cosmic ray (UHECR) detectors, is reported. Two independent calibrations of the fluorescence emission induced by a 120 GeV proton beam were employed: Cherenkov light from the beam particle and calibrated light from a nitrogen laser. The fluorescence yield in air at a pressure of 1013 hPa and temperature of 293 K was found to be Y337=5.61±0.06stat±0.22systY337=5.61±0.06stat±0.22syst photons/MeV. When compared to the fluorescence yield currently used by UHECR experiments, this measurement improves the uncertainty by a factor of three, and has a significant impact on the determination of the energy scale of the cosmic ray spectrum.
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http://hal.in2p3.fr/in2p3-00813541
Contributor : Sophie Heurteau <>
Submitted on : Monday, April 15, 2013 - 5:28:12 PM
Last modification on : Wednesday, September 16, 2020 - 4:07:54 PM

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M. Ave, M. Bohacova, E. Curry, P. Di Carlo, C. Di Giulio, et al.. Precise measurement of the absolute fluorescence yield of the 337 nm band in atmospheric gases. Astroparticle Physics, Elsevier, 2013, 42, pp.90-102. ⟨10.1016/j.astropartphys.2012.12.006⟩. ⟨in2p3-00813541⟩

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