A Caltech Library Service

Photoproduction of Positive K Mesons in Hydrogen


Donoho, Paul Leighton (1958) Photoproduction of Positive K Mesons in Hydrogen. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/7E23-FM47.


NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. In the experiment described here K+ mesons produced in a liquid hydrogen target by the 1100 Mev bremsstrahlung from the California Institute of Technology Synchrotron have been observed. It has been found that the K+ mesons are produced in association with [...] hyperons, as required by the law of associated production, thus confirming the validity of this law in electromagnetic interactions. The K+ mesons are momentum analyzed in a magnetic spectrometer and identified by their energy loss in three scintillation counters, the very large background due to pions and protons being virtually eliminated by means of a time-of-flight velocity measurement. The differential cross section for the reaction [...] has been measured at photon energies of 960 Mev, 1000 Mev, and 1060 Mev at various K+ meson laboratory angles between 15 degrees and 45 degrees. This cross section shows little variation with photon energy between 960 Mev and 1060 Mev. There is a decrease in the cross section at backward center-of-momentum angles at both 1000 Mev and 1060 Mev. The magnitude of the K - [...] coupling constant estimated from these measurements is smaller by a factor of about five than the pion-nucleon coupling constant, if the K+ meson is assumed to be pseudoscalar.

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):
  • Walker, Robert Lee
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1958
Record Number:CaltechETD:etd-10072004-134210
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3969
Deposited By: Imported from ETD-db
Deposited On:07 Oct 2004
Last Modified:16 Oct 2023 18:41

Thesis Files

PDF (Donoho_pl_1958.pdf) - Final Version
See Usage Policy.


Repository Staff Only: item control page