University of Illinois Urbana-Champaign

A search for parity non-conservation in polarized proton-nucleon scattering at 6 GEV/C

Alde, Douglas Marshall

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Description

Title
A search for parity non-conservation in polarized proton-nucleon scattering at 6 GEV/C
Author(s)
Alde, Douglas Marshall
Issue Date
1979
Doctoral Committee Chair(s)
Frauenfelder, Hans
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • parity non-conservation
  • polarized proton-nucleon scattering
  • incident proton helicity
  • hadronic system
Language
en
Abstract
An experiment has been performed at the Argonne National Laboratory Zero Gradient Synchrotron to measure the dependence of the total proton-nucleon cross section on the helicity of the incident proton. A dependence of the total cross section on the proton helicity is a measure of the strength of the weak interaction in the hadronic system. The cross section was determined by measuring the transmission of 6 GeVlc polarized (-26.3 ± 7.5) 10 where 0 (0) is the total section for positive protons through an H20 target. integral counting techniques were used to achieve the high data rates required for the measurement of the small effect. We measured the cross section asymmetry (sigma+ - sigma_)/(sigma+ + sigma_) = (-26.3 +- 7.5) x 10-5 where sigma+ (sigma_) is the total cross section for positive (negative) helicity protons incident on an H20 target. The asymmetry is substantially larger than predicted by conventional theories of the weak interaction. Systematic contributions to the asymmetry are discussed. This result may include systematic contributions which were not measured or were measured Inadequately by our apparatus. Suggestions for improving the experiment are made. Preliminary results for the asymmetry from the improved version of the experiment are given which are consistent with zero.
Type of Resource
text
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http://hdl.handle.net/2142/25550
Copyright and License Information
1979 Douglas Marshall Alde

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