Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-08
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures. Proceedings of 29th International Cosmic Ray Conference (ICRC) 2005, Pune, India
Scientific paper
Photon yields in damp air excited by an electron using a Sr90 $\beta$ source
are compared withthose in dry air. Water vapors considerably reduce the yields,
however, a further study is needed to evaluate the effects on the energy
estimation of ultrahigh-energy cosmic rays. The relation of fluorescence
efficiency to the life time of de-excitation by radiation is discussed.
Kobayakawa Keizo
Nagano Motohiko
Sakaki Naoto
Watanabe Yu
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