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Measurement of Recoil Proton Polarization in Pion Photoproduction at 60 and 90 Degrees, Using a Wire Chamber System


Cheng, Shui-uh (1970) Measurement of Recoil Proton Polarization in Pion Photoproduction at 60 and 90 Degrees, Using a Wire Chamber System. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/ZZ7S-N440.


We measured the recoil proton polarization in the reaction γp --> π°p at the Caltech electron synchrotron at pion CM production angles around 60° and 90°, and photon energies from 0.65 to 1.375 GeV.

Recoil protons were momentum-analyzed by a bending magnet along with a counter-wire spark chamber system. The polarization was determined by measuring the left-right asymmetry of p-C scatterings in a carbon plate range chamber. The data acquisition 'Was handled by an on-line PDP-5 computer.

Among the 600,000 events taken, approximately 18,000 p-C scattered events survived the kinematics tests and requirements of analyzing power to yield 23 polarization points.

The results indicate a strong angular dependence throughout the angular and energy regions covered. They agree very well with earlier results, but with improved statistics and with finer energy binning in the region of overlap.

π° photoproduction cross sections in the same kinematical region were also measured in the process. The agreement with known values is excellent.

These results are interpreted in the framework of an isobar and partial wave model of π° photoproduction.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Physics)
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Heusch, Clemens A.
Thesis Committee:
  • Unknown, Unknown
Defense Date:25 May 1970
Additional Information:Thesis title in 1970 Caltech commencement program varies: Measurement of Recoil Proton Polarization in π⁰ Photoproduction at 60°and 90°, Using a Wire Chamber System
Record Number:CaltechTHESIS:04182011-140156186
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6337
Deposited By: Tony Diaz
Deposited On:26 Apr 2011 17:02
Last Modified:07 May 2024 21:19

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