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Charge Spectrum of the Heavy Primary Cosmic Rays


Stern, Edward Abraham (1955) Charge Spectrum of the Heavy Primary Cosmic Rays. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/JXAV-WY56.


NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. A measurement at [...] and 95,000 feet was made of the heavy primary cosmic-ray charge spectrum [...] by means of a pulse ionization chamber. The characteristics of the chamber and associated electronics are described. The effect of nuclear stars on the counting rate of the chamber was determined experimentally by sending up simultaneously two chambers, one filled with argon at half the pressure of the other. Slow evaporation particles will stop in the chambers and give the same pulses independent of pressure. Cosmic rays give pulses proportional to the gas pressure. Comparing the two chamber counting rates permits a determination of the star contribution. Other causes of the background counting rate were discussed and corrected for. It was concluded that Be and B combined are as abundant in the primary beam as the CNO group. The flux of the heavy particles [...] was also determined. It was not possible to obtain any information on the abundance of Li. A suggested improved version of the equipment is described and possible experiments are discussed.

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:Fellow of the American Physical Society, 1992.
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Neher, Henry Victor
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1955
Additional Information:Title varies in the 1955 Caltech commencement program: "Charge Spectrum of Heavy Primary Cosmic Rays"
Record Number:CaltechETD:etd-01272004-152920
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:370
Deposited By: Imported from ETD-db
Deposited On:29 Jan 2004
Last Modified:06 Jul 2023 23:27

Thesis Files

PDF (Stern_ea_1955.pdf) - Final Version
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