Polarization of recoil protons from the photoproduction of neutral pions in hydrogen between 750 and 1450 MeV

Citation

Bloom, Elliott Daniel (1967) Polarization of recoil protons from the photoproduction of neutral pions in hydrogen between 750 and 1450 MeV. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-05032005-103209

Abstract

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In a recent experiment on [...] photoproduction at the Caltech 1.5 BeV Electron Synchrotron, the polarization of the recoil proton was measured. The measurement was performed using a scattering and range spark chamber built out of variable thickness carbon modules. The sample of [...] was pure to better than 98%. Approximately 3500 useful scatters were obtained to yield polarization values, around 60[...] c.m. for the produced pion, for incoming photon energies 750 [...] k [...] 1450 MeV. The polarization values were obtained with a maximum likelihood method. A thorough investigation was made of all analyzing power data available for proton carbon scattering.

The results indicate a striking angular dependence, with the polarization changing sign for [...] ~ 60[degrees] to 70[degrees] throughout the energy region covered. These results are interpreted in the framework of an isobar model of [...] photoproduction with Regge-ized [...] exchange amplitude added.

Thesis Files