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Title:Investigation of the giant resonance region of carbon with (electron,electron'photon)
Author(s):Ammons, Edsel Albert
Doctoral Committee Chair(s):Papanicolas, Costas N.
Department / Program:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Physics, Nuclear
Abstract:We report here on progress toward utilization of the (e, e$\sp\prime\gamma$) reaction for the study of giant resonances. The reaction mechanism of this purely leptonic probe is known since it is governed by quantum electrodynamics. Because the long wavelength approximation is applicable, for the emitted photon, the (e, e$\sp\prime\gamma$) reaction is highly selective of the multipolarity of the giant resonance response. However, the small photon-emission probability of the giant resonances, their broad nature, and competition from bremsstrahlung photons, have suggested that use of the (e, e$\sp\prime\gamma$) reaction in the study of the giant resonances would be very difficult.
In a series of experiments at the Nuclear Physics Laboratory of the University of Illinois, utilizing a 100 MeV electron beam provided by the MUSL-2 microtron, measurements on $\sp{12}$C have demonstrated the feasibility of the (e, e$\sp\prime\gamma$) probe of the giant resonance region. Measurements were taken at momentum transfers of.32 fm$\sp{-1}$ and.46 fm$\sp{-1}$ for excitation energies covering the 13 to 30 MeV region. By forming missing energy spectra, cross sections, both differential and integrated over the giant resonance region, were obtained for (e, e$\sp\prime\gamma$) in which the nucleus exits in the ground state or in one of the first two excited states at 4.44 MeV and 7.65 MeV.
Issue Date:1992
Rights Information:Copyright 1992 Ammons, Edsel Albert, Jr
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9236389
OCLC Identifier:(UMI)AAI9236389

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