Polarixation of Recoil Protons from the Photoproduction of Neutral Pions in Hydrogen Between 750 and 1450 MeV

Author: Bloom, Elliott Daniel

Year: 1967

Degree: Dissertation (Ph.D.)

Advisors: Heusch, Clemens A.; Walker, Robert Lee

Committee Member: Unknown, Unknown

Option: Physics

DOI: 10.7907/SEXB-B858

Abstract

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.

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.

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