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Capture Cross Section of C¹³ for Low Energy Protons


Woodbury, Eric John (1951) Capture Cross Section of C¹³ for Low Energy Protons. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/9KQX-4335.


In order to measure the capture cross section of C13 at the lowest possible energy a scintillation detector in conjunction with a high current ion source was developed. Because of heat dissipation problems the ion source was pulsed and suitable electronic circuitry was developed to take advantage of the peak currents available. With this equipment it was found possible to obtain proton currents of one milliampere and a detection efficiency of eight percent.

At 128 kilovolts the capture cross section is,

σ = 5.0 ± 1.0 x 10-33 cm2

Of the resulting radiation approximately eighty percent is 8 Mev in energy while the remaining is either a two or three step cascade with gamma ray energies between two and four million volts of energy.

In the equation,

σ = a/E e-b/E 1/2

b = 5.96 Mev1/2, and a = 10-2 Mev barn.

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
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Christy, Robert F.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1951
Funding AgencyGrant Number
Office of Naval ResearchUNSPECIFIED
Record Number:CaltechTHESIS:10112017-143307471
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10506
Deposited By: Benjamin Perez
Deposited On:11 Oct 2017 22:07
Last Modified:04 May 2023 21:52

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