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The Polarization of the Recoil Proton in Eta Photoproduction


Winstein, Bruce Darrell (1970) The Polarization of the Recoil Proton in Eta Photoproduction. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/9Y7A-3S44.


We measured the recoil proton polarization in the process γp → pη at the 1.5 GeV Caltech electron synchrotron, at photon energies from 0.8 to 1.1 GeV, and at center-of-mass production angles around 90°. A counter-spark chamber array was used to determine the kinematics of all particles in the final state of the partial mode γp → pη (η → 2γ). The protons' polarization was determined by measuring an asymmetry in scattering off carbon. Analysis of 280,000 pictures yielded 2400 useful scatters with a background which was 30% of the foreground. The polarization results show a sizeable opposite parity interference at 830 MeV, 950 MeV, and 1100 MeV.

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:21 May 1970
Funding AgencyGrant Number
State of CaliforniaUNSPECIFIED
Record Number:CaltechTHESIS:08312015-110451298
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9125
Deposited By: Benjamin Perez
Deposited On:31 Aug 2015 18:26
Last Modified:22 May 2024 21:25

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