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Cloud Chamber Studies in Cosmic Rays at an Altitude of 30,000 Feet


Adams, Raymond Voiles, Jr. (1948) Cloud Chamber Studies in Cosmic Rays at an Altitude of 30,000 Feet. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/DVVV-TS23.


Cloud chamber observations of cosmic rays have been made in a B-29 aircraft, flying at altitudes of 30,000 ft. A 17-cm cloud chamber in a magnetic field of 7500 gauss was employed. From curvature measurements on 245 cloud tracks, the energy spectrum of cosmic rays at 30,000 ft has been determined. In contrast to the roughly equal numbers of positive and negative particles which are fom1d at sea level, the high altitude data show that positive particles dominate the negative particles by a ratio of 2:1. The different forms of the positive and negative spectra show that there exists among the positives a type of particle which is not represented among the negatives. The data are consistent with the hypothesis that these positives are protons, measured energies of which extend to 2.5 Bev. At least three-fourths of the protons probably are secondary particles. The remainder may well come directly from a primary proton component.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Physics; Mathematics
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Minor Option:Mathematics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Anderson, Carl D.
Thesis Committee:
  • Anderson, Carl D. (chair)
  • Epstein, Paul Sophus
  • Smythe, William Ralph
  • Tolman, Richard C.
  • Wear, Luther Ewing
  • Zwicky, Fritz
  • Ward, Morgan
Defense Date:1948
Funding AgencyGrant Number
Office of Naval Research (ONR)N6onr-102
National Research CouncilUNSPECIFIED
Record Number:CaltechTHESIS:08292019-163400736
Persistent URL:
Related URLs:
URLURL TypeDescription ItemArticle in CaltechAUTHORS
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11771
Deposited By: Mel Ray
Deposited On:30 Aug 2019 17:48
Last Modified:17 Oct 2023 23:55

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