Photoproduction of Neutral Pions in Hydrogen from 600 to 800 Mev

Citation

Worlock, Robert Montague (1958) Photoproduction of Neutral Pions in Hydrogen from 600 to 800 Mev. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/JGJQ-MC58. https://resolver.caltech.edu/CaltechETD:etd-04122005-091121

Abstract

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The photoproduction of neutral [pi] mesons from hydrogen has been studied at the California Institute of Technology Synchrotron Laboratory by detecting recoil protons from a liquid hydrogen target irradiated by the synchrotron bremsstrahlung beam. The recoil protons were detected by a five counter telescope which comprised a standard three scintillation counter range telescope plus an additional dE/dx counter for more positive identification of the proton and a Cerenkov counter in anticoincidence to eliminate events due to multiple electrons. The effect of recoil protons from pion pair production was reduced by lowering the bremsstrahlung endpoint energy to about 100 mev above that of the photons producing the desired events. Even so, contamination was significant at forward proton angles and correction for this effect was necessary. Data were taken at proton laboratory angles of 19[degrees], 30[degrees], 40[degrees], 50[degrees], and 60[degrees] at proton energies corresponding to photon energies of 600, 700, and 800 mev. Angular distribution data are produced at these three energies and fitted with functions of the form: A + B cos [...] + C cos[...]. These functions are qualitatively like those at lower energies; B is small and -A/C is roughly 1.25. The total cross-section is found to have a minimum at about 600 mev, being slightly larger at 700 and 800 mev.

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