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Title: The two-body photodisintegration of deuterium from 200 Mev to 600 Mev
Author: Crawford, Rebecca
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 1994
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This thesis presents an experimental study of the D(γ,p)n breakup channel of the photodisintegration of deuterium in which both the total cross section σtot, and the differential cross section, dσ/dΩ, have been measured over the photon energy range 200-600 MeV. The experiment was performed at the recently completed tagged photon facility of the 855 MeV Microtron MAMI-B, at the Mainz Institut fur Kernphysik, Germany. The experiment used the GLASGOW tagging spectrometer in conjunction with the large acceptance detector DAPHNE achieving systematic and statistical errors of a few percent and extending the range of photon energies previously studied. Data taking started in May 1992, as part of the first round of approved experiments at MAMI-B. The GLASGOW tagging spectrometer was used to determine the photon energy with a resolution of about 2 MeV at intensities up to 5 · 10⁵ photons per channel. Photon flux normalisation was determined to +/- 2%. A 270 mm long cryogenic target filled with liquid deuterium was placed coaxially with the beam. Protons were detected in the large acceptance tracking detector DAPHNE (3.7π steradians) whose coverage of the azimuthal angle was complete and whose polar angular range was 21°-159° The central vertex detector of DAPHNE provided good definition of charged particle angles; the polar angular resolution was < 1° and the azimuthal resolution < 2°. The precise angular information together with the good definition of photon energy defines the reaction kinematics without the need to rely on experimentally determined proton energies. This redundancy of information allows a good rejection of background events. The Monte Carlo code GEANT was used to simulate the experiment in order to evaluate systematic corrections to be applied to the data. Included in the GEANT simulation are the effects of detector geometry and thresholds. In addition the physical processes resulting from the interaction of protons with the detector materials are considered, including energy deposition in the target and detecting layers, non-linear light response of the scintillators, multiple scattering and nuclear interactions of the protons. The extensive data are presented in the form of twenty-one angular distributions and their corresponding integrated total cross sections at photon energies in the range 200 to 600 MeV, in steps of 20 MeV. The total systematic error is estimated to be less than 4%. Previous experimental work is reassessed in the light of the present results and the results compared with two very recent theoretical calculations by the Mainz group.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available