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Cloud Chamber Studies of Cosmic Rays


Fletcher, James Chipman (1948) Cloud Chamber Studies of Cosmic Rays. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/6JJR-MV34.


The large magnet and 22" diameter cloud chamber constructed by Dr. S. H. Neddermayer and Dr. C. D. Anderson has been used in an attempt to observe mesotron disintegrations at sea level. Although no recognizable disintegrations were observed, useful data concerning energy loss of charged particles in carbon were obtained.

It was found that the present theory of energy loss of electrons first derived by Bloch and others is in very good agreement with the experimental results for the energy range 3-25 Mev. Also the results obtained provide good agreement with the theory of knock-on production by mesotrons for knock-ons whose energies lie in the range of 2-50 Mev.

It is believed that information about knock-ons of somewhat higher energies than this would be quite useful in determining some of the properties of the mesotron.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Physics and Mathematics)
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Minor Option:Mathematics
Awards:Caltech Distinguished Alumni Award, 1966
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Anderson, Carl D.
Group:Caltech Distinguished Alumni Award
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1948
Record Number:CaltechETD:etd-04122004-162257
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1353
Deposited By: Imported from ETD-db
Deposited On:14 Apr 2004
Last Modified:21 Mar 2023 22:13

Thesis Files

PDF (Fletcher_jc_1948.pdf) - Final Version
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