Vette, James I. (1958) Photoproduction of neutral pions in hydrogen from 500 to 950 mev. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-04112005-090012
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The process [...] has been studied by detecting recoil protons from a liquid hydrogen target which was bombarded by the bremsstrahlung beam of the California Institute of Technology electron synchrotron. The angle and momentum of the recoil protons were measured by a magnetic spectrometer-three scintillation counter coincidence system. The process has been studied between photon laboratory energies of 490 and 940 Mev. and between pion center-of-mass angles of [...] and [...]. Protons which arose from meson pair production were significant at forward laboratory angles. A correction for this contamination is discussed. The rapid decrease of the total cross section above 320 Mev. continues out to 600 Mev. and then rises slightly reaching a peak value around 800 Mev. The center-of-mass angular distributions are analyzed in a power series of the cosine of the pion angle and it is found that terms up to the fourth power are necessary to fit the data above 600 Mev. A multipole expansion is made assuming that mesons are produced in only S, P and D states; this expansion is used to show that no single multipole absorption is responsible for the rise in the cross section above 600 Mev.
|Item Type:||Thesis (Dissertation (Ph.D.))|
|Degree Grantor:||California Institute of Technology|
|Division:||Physics, Mathematics and Astronomy|
|Thesis Availability:||Public (worldwide access)|
|Defense Date:||1 January 1958|
|Default Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Imported from ETD-db|
|Deposited On:||11 Apr 2005|
|Last Modified:||26 Dec 2012 02:37|
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