A Study of Pion Photoproduction on Carbon-12 in the Delta Resonance Region
Date
1995Author
MacKenzie, John Alan
Metadata
Abstract
This thesis describes a study of the 12 C(gamma; pie + n) reaction in the Delta resonance re
gion using tagged photons. The experiment was accomplished using the MAMIB
c.w. electron accelerator at the Institut f¨ur Kernphysik, Mainz. Bremsstrahlung
photons, created when 855 MeV electrons strike a 4 ¯m Nickel radiator, were
tagged with a 2 MeV resolution using the Glasgow tagging spectrometer installed
in the MAMI A2 experimental hall.
The data is presented as triple and (by integrating over the pion energy) double
differential cross sections. A comparison is made with Distorted Wave Impulse
Approximation (DWIA) predictions generated by the code THREEDEE. It is
concluded that more reliable theoretical calculations are required. In particular,
a better treatment of the distortion and absorption of the outgoing particles is
needed.
Initial comparisons with the microscopic theory of Carrasco are attempted
and the problems faced in making such a comparison are described and solutions
suggested.