Investigation of the giant resonance region of 1̳2̳C with (e,e'[gamma])

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Year dc:date

2011

Author dc:creator

• Ammons, Edsel Albert

Contributors dc:contributor

• Papanicolas, Costas N.

• giant resonance
• quantum electrodynamics
• leptonic probe

Statement dc:rights

• 1992 Edsel Albert Ammons

Language dc:language

en

Identifier

3490552

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/18909