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Production and Annihilation of Antiprotons


Helstrom, Carl Wilhelm (1951) Production and Annihilation of Antiprotons. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/RCCV-Z308.


If protons and neutrons are Dirac particles, as one usually assumes, the corresponding antiparticles should ex­ist, but these have never been observed. The coupling of nucleons with the meson field offers processes by which these particles could be created in energetic collisions be­tween nucleons and mesons or other nucleons. In this thesis the pseudoscalar meson theory is used to calculate cross-sec­tions for the production of antiprotons in such collision processes. These are applied to estimate the numbers of antiprotons to be expected from the interaction of cosmic­ ray particles with the nucleons of the atmosphere. It is found that meson production is about 60 times more frequent than antinucleon production for the complete primary cosmic­ ray spectrum, but that antinucleon production is of compar­able probability with meson production for energies greater than about 1011 e.v. Cross-sections are also calculated for the annihilation of antiprotons in collisions with protons and neutrons, with emission of mesons.

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
DuPont (United States)UNSPECIFIED
Record Number:CaltechTHESIS:10132017-101145132
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10515
Deposited By: Benjamin Perez
Deposited On:13 Oct 2017 18:29
Last Modified:03 May 2023 18:41

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