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Title:Investigation of the giant resonance region of 1̳2̳C with (e,e'[gamma])
Author(s):Ammons, Edsel Albert
Doctoral Committee Chair(s):Papanicolas, Costas N.
Department / Program:Physics
Subject(s):giant resonance
quantum electrodynamics
leptonic probe
Abstract:We report here on progress toward utilization of the ( e, e'1) 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'1) reaction is highly selective of the multi polarity 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'1) 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 12C have demonstrated the feasibility of the (e,e'1) probe of the giant resonance region. Measurements were taken at momentum transfers of .32 fm-1 and .46 fm-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'1) 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
Genre:Dissertation / Thesis
Rights Information:1992 Edsel Albert Ammons
Date Available in IDEALS:2011-05-04
Identifier in Online Catalog:3490552

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