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Photoproduction of neutral pions from protons in the forward direction in the region of the second and third resonances

Citation

Talman, Richard Michael (1963) Photoproduction of neutral pions from protons in the forward direction in the region of the second and third resonances. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-04122005-131152

Abstract

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The cross section for photoproduction of neutral pions from protons has been measured at energies near 750, 915 and 1150 Mev and over most of the forward-going [...] C.M. hemisphere. The experimental technique consisted of detecting both of the [...] decay photons with lead glass total absorption counters and, when convenient, the recoil proton with a single scintillation counter. The method is subject to rather large systematic errors but, within these, our results are consistent with other experiments wherever there are overlapping points.

Our data has the striking feature that the cross section is very small at [...] in the region of the second and third pion nucleon resonances. Also, although the data is not inconsistent with a simple first, second and third resonance model, it appears likely that above the third resonance the pole process consisting of the exchange of a single vector meson is becoming important or even dominant. The evidence at this time mildly suggests that this behaviour is largely due to [...] mesons and under that hypothesis we are able to estimate some [...] meson coupling constants. For example, using a prescription of Gell-Mann and Zachariasen, we estimate the partial width for the decay [...] to be 240 Kev.

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):
  • Tollestrup, Alvin V.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1963
Record Number:CaltechETD:etd-04122005-131152
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-04122005-131152
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1356
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:15 Apr 2005
Last Modified:26 Dec 2012 02:37

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