A telescope is described which has been used to determine the directional characteristics of the Čerenkov radiation accompanying extensive cosmic ray air showers. The reflecting telescope has a 12.5‐in. aperture, a 48‐in. focal length and is of an off‐axis design to permit the use of a 19 photomultiplier tube light detection array. Pulse‐height information from each tube is fed to separate, spaced inputs on a delay line which supplies the resulting signal for oscilloscope presentation. The various pulse heights provide the Čerenkov radiation directional information. An average of 75% of the Čerenkov photons arrive at the telescope within a half‐angle of 2.3°.
REFERENCES
1.
2.
W. Galbraith, Extensive Air Showers (Academic Press, Inc., New York, 1958), Chap. 8.
3.
J. V. Jelley, Čerenkov Radiation (Pergamon Press, New York, 1958), Chap. 9.
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F. R. Barclay and J. V. Jelley, Proceedings of the Oxford Conference on Extensive Air Showers, edited by T. E. Cranshaw (London, 1956).
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A. E. Chudakov, N. M. Nesterova, V. I. Zatsepin, and E. I. Tukish, Proceedings Moscow Cosmic Ray Conference (Moscow, 1960), Vol. II, p. 50.
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F. I. Boley, J. H. Baum, J. A. Palsedge, and J. H. Pereue, Phys. Rev. (to be published).
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M. H.
Brennen
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Lehane
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8
, 653
(1958
).8.
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© 1962 The American Institute of Physics.
1962
The American Institute of Physics
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