Determination of the Real Part of the Compton Amplitude at a Nucleon Resonance

Brodsky, Stanley J.; Hearn, Anthony C.; Parsons, Ronald G.

doi:10.1103/physrev.187.1899

Cited by 8 publications

(2 citation statements)

References 11 publications

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“…26, by the replacenlent in which k is the incident photon energy and X is the mean free path of the resonance in nuclear matter. For the first and second resonances, the mean free paths in carbon computed from the total photoproduction cross sections are 2 and 8 F, leading to corrections of approximately 25 and 10%, respectively, to the unmodified widths.…”

Section: Contributions From Bix C* Interferencementioning

confidence: 99%

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Asymmetric Electron Pair Production on Carbon

Simonds

Richter

1970

Phys. Rev. D

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The cross section for the reaction y+C 4 ef+e-+C has been measured for a series of kinematic points giving nuclear momentum transfers in the region 0.2-0.7 F-2, with incident photon energies in the region for photoproduction of the first two pion-nucleon resonances. Measurements were made, using asymmetric detection geometry, of electron and positron cross sections for each point. The charge-independent yields are shown to be in agreement with predictions of quantum electrodynamics for coherent and quasi-elastic production on carbon. The charge-asymmetric results are shown to be consistent with recent estimates of the interference between Bethe-Heitler and Compton pair production amplitudes with excitation of an intermediate r -N state in the Compton diagram. *Research sponsored by the U. S. Office of Naval Research Contra~t,No. Nonr 225(6'3) and by the U. S. Atomic Energy Commission. t This paper is based on a thesis submitted by one of the authors (R.M.S.) in partial fulfillment of the requirements for the degree of Doctor of Philosophy. $ Present address: Cambridge Electron Accelerator, Cambridge, Mass.

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Section: Contributions From Bix C* Interferencementioning

confidence: 99%

“…If the ylTN* vertex is dominated by the M 1 transition, as experimentally supported, and if the finalstate electron and positron are restricted to small modification to the result of Ref 26. has been the addition of the factor A j Z for the use of a nuclear target.…”

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confidence: 91%