期刊
ASTROPARTICLE PHYSICS
卷 42, 期 -, 页码 90-102出版社
ELSEVIER
DOI: 10.1016/j.astropartphys.2012.12.006
关键词
Nitrogen fluorescence yield; Air fluorescence detection; Ultra-high energy cosmic rays
资金
- Kavli Institute for Cosmological Physics at the University of Chicago [NSF PHY-0114422, NSF PHY-0551142]
- Kavli Foundation
- University of Chicago, USA
- Department of Energy under section H.44 of Department of Energy, USA [DE-AC02-07CH11359, DE-AC02-06CH11357]
- MSMT CR, Czech Republic [LA08016]
- BMBF, Germany [05A08VK1]
- Istituto Nazionale di Fisica Nucleare (INFN), Italy
- Division Of Physics
- Direct For Mathematical & Physical Scien [1068696] Funding Source: National Science Foundation
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 Y-337 = 5.61 +/- 0.06(stat) +/- 0.22(syst) 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. (c) 2012 Elsevier B.V. All rights reserved.
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