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Radioactive Elements of a Low Atomic Number


Fowler, William Alfred (1936) Radioactive Elements of a Low Atomic Number. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/JHMA-4140.


Radioactive elements of low atomic number have been produced by the transmutation of various elements from lithium to fluorine by high velocity deuterons. The distribution in energy of the electrons and positrons emitted by these elements has been determined by employing a Wilson cloud chamber traversed by a magnetic field. The electron spectra nave been found to have maximum energies from 5 to 13 MEV while the positron spectra have maximum energies from 1 to 2 MEV. The form of the spectra has been found to be in agreement with a modification of the Fermi theory of beta-decay proposed by Konopinski and Uhlenbeck. The correlation of the maximum energies of the spectra with the energies calculated from the reactions in which the radioactive element is involved is shown to await a more accurate determination in the difference in mass between the neutron and proton.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Physics
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Awards:The Nobel Prize in Physics, 1983.
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Lauritsen, Charles Christian
Group:Nobel Prize
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1936
Additional Information:The Nobel Prize in Physics 1983 was divided equally between Subramanyan Chandrasekhar "for his theoretical studies of the physical processes of importance to the structure and evolution of the stars" and William Alfred Fowler "for his theoretical and experimental studies of the nuclear reactions of importance in the formation of the chemical elements in the universe."
Record Number:CaltechETD:etd-10112002-114537
Persistent URL:
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URLURL TypeDescription Prize announcement (Physics, 1983)
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4025
Deposited By: Imported from ETD-db
Deposited On:11 Oct 2002
Last Modified:06 Oct 2020 01:16

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