Arrival Directions of Cosmic-Ray Air Showers from the Equatorial Sky

Arrival Directions of Cosmic-Ray Air Showers from the Equatorial Sky The celestial arrival directions of over 100 000 showers with sizes greater than 10 5 particles have been determined by fast timing in observations at an altitude of 2034 m. The observations covered a band of declinations from -30° to +50° with an angular resolution of 4°, and they extended a survey begun in an earlier experiment that covered the northern sky. As in the earlier experiment no significant deviation from isotropy was found. The atmospheric attenuation of the shower intensity was determined from the zenith angle distribution, and also from a comparison of the absolute shower intensity at 2034 m and at sea level. Within an experimental uncertainty of about 5%, both methods yield an exponential attenuation length consistent with the value of 107 g cm - 2 previously found at sea level. The absolute intensity of showers with more than 10 5 particles at 2034 m was found to be (1.11±0.30)× 10 - 9 cm - 2 sec - 1 sr - 1 . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

Arrival Directions of Cosmic-Ray Air Showers from the Equatorial Sky

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1960 The American Physical Society
ISSN
1536-6065
D.O.I.
10.1103/PhysRev.119.1085
Publisher site
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Abstract

The celestial arrival directions of over 100 000 showers with sizes greater than 10 5 particles have been determined by fast timing in observations at an altitude of 2034 m. The observations covered a band of declinations from -30° to +50° with an angular resolution of 4°, and they extended a survey begun in an earlier experiment that covered the northern sky. As in the earlier experiment no significant deviation from isotropy was found. The atmospheric attenuation of the shower intensity was determined from the zenith angle distribution, and also from a comparison of the absolute shower intensity at 2034 m and at sea level. Within an experimental uncertainty of about 5%, both methods yield an exponential attenuation length consistent with the value of 107 g cm - 2 previously found at sea level. The absolute intensity of showers with more than 10 5 particles at 2034 m was found to be (1.11±0.30)× 10 - 9 cm - 2 sec - 1 sr - 1 .

Journal

Physical ReviewAmerican Physical Society (APS)

Published: Aug 1, 1960

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