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Title: An investigation into the mass dependence of photonuclear pion production
Author: Johnstone, Douglas
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1995
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Measurements of the (γ,π+n) reaction have been carried out using 6Li, 12C and 40Ca as targets. This work is part of a series of experiments conducted by Edinburgh University in collaboration with the Universities of Glasgow and Tübingen. The experiment was carried out using the 855 MeV MAMI-B electron accelerator at the Institut für Kernphysik, Mainz. The 855 MeV continuous electron beam was directed onto a 4 μm Nickel radiator producing bremsstrahlung photons which were tagged with a resolution of 2 MeV using a spectrometer. These photons were made to impinge on the target and two detector arrays were used to detect reaction products. PiP, a plastic scintillator hodoscope, was used to detect positive pions; and TOF, a time-of-flight array, was used to detect the neutrons. PiP covered an angular range of 50° < θπ < 130°, -20° < øπ < 20° and an energy range of 30 MeV < Tπ < 180 MeV. TOF covered an angular range of 10° < θn < 150°, 160° < øn < 200° and had a lower energy limit of Tn = 30 MeV. Data were obtained for the photon energy range 240 MeV < Eγ < 400 MeV. The overall missing energy resolution of the experiment was ˜ 15 MeV. The data are presented as double differential cross-sections against pion energy. They are compared to a theoretical code developed by Oset et al. Agreement between experiment and theory is good at low values of Eγ and low target mass, A, but divergences occur for both increasing Eγ and increasing A. Possible reasons for these results are presented and future work in both theory and experiment is suggested.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available