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Type of Document	Dissertation
Author	Hauser, Michael George
Author's Email Address	none@none
URN	etd-09182002-112358
Persistent URL	http://resolver.caltech.edu/CaltechETD:etd-09182002-112358
Title	Photoproduction of charged pion pairs and [doubly positive nucleon resonance(1238)] in hydrogen from 0.9 to 1.3 GeV
Degree	PhD
Option	Physics
Advisory Committee	Advisor Name Title unknown Committee Member
Keywords	none
Date of Defense	1967-01-23
Availability	unrestricted
Abstract NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. 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.
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