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Photoproduction of charged pion pairs and [doubly positive nucleon resonance(1238)] in hydrogen from 0.9 to 1.3 GeV

Citation

Hauser, Michael George (1967) Photoproduction of charged pion pairs and [doubly positive nucleon resonance(1238)] in hydrogen from 0.9 to 1.3 GeV. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-09182002-112358

Abstract

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The momentum spectrum and angular distribution of negative pions produced in the reaction [...] have been measured at eight incident photon energies from from 0.9 to 1.3 GeV. The reaction was produced in a liquid hydrogen target illuminated by a bremsstrahlung beam from the Caltech synchrotron. Negative pions were detected and momentum analyzed with a magnetic spectrometer employing a combination of scintillation counters and Cherenkov counters. The incident photon energy was fixed by using the technique of bremsstrahlung subtraction. The cross section for the pseudo-two-body reaction [...] was obtained by fitting the [pi(superscript-)] momentum spectrum at each angle and energy with a linear combination of a resonance term and a three-body phase space term. The angular distribution of the [pi(superscript-)] in [...] production is in good qualitative and fair quantitative agreement with predictions of the Drell (OPE) model. Gauge invariant models are in poorer agreement with the data. The total cross section for pion pair production decreases smoothly from 78.9 ? 2.9[...] at .93 GeV to 59.1 ? 5.2 [...] at 1.29 GeV, whereas the [...] part of the cross section decreases from 45.0 ? 2.4 [...] to 18.2 ? 3.5 [...] over the same range. A slight shoulder in each of these cross sections suggests formation of [nucleon resonance(1688)] as an intermediate state.

Item Type:Thesis (Dissertation (Ph.D.))
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Walker, Robert Lee
Thesis Committee:
  • Unknown, Unknown
Defense Date:23 January 1967
Record Number:CaltechETD:etd-09182002-112358
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-09182002-112358
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3608
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:18 Sep 2002
Last Modified:26 Dec 2012 03:01

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