Coherent Production of Neutral Pions on 12C and 40Ca

Fog, Lotte S (2001) Coherent Production of Neutral Pions on 12C and 40Ca. PhD thesis, University of Glasgow.

Abstract

Neutral pion photo-production is a useful tool to investigate several aspects of nu-clear physics. Information can be extracted on the matter distribution, the pion-nucleus interaction and the medium modifications of the pion production process. In the present experiment, neutral pions were produced on 12C and 40Ca at the tagged photon facility at MAMI. The pion decay photons were detected using the detector array TAPS, a highly segmented detector array built to detect light mesons. The differential and integrated cross sections for coherent photo-production of neutral pions from 12C and 40Ca were measured in the incident photon energy range 135-380 MeV. The diffraction-like pattern of the differential cross section was demonstrated. Comparisons with the plane and distorted wave impulse approximation models show the importance of including a description of the final state interactions in the theoretical models but suggest that the magnitude of the pion-nucleus interaction is underestimated in the DWIA model. Comparisons with the recent delta resonance energy model suggest that modifications of the process due to changes to the properties of the A in the nuclear medium were present but that modifications are needed to the parameterisation of the A properties used in the DREN model.

• Item Type: Thesis (PhD)
• Qualification Level: Doctoral
• Additional Information: Adviser: R O Owens
• Keywords: High energy physics, Nuclear physics and radiation
• Date of Award: 2001
• Depositing User: Enlighten Team
• Unique ID: glathesis:2001-76092
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 19 Nov 2019 16:50
• Last Modified: 19 Nov 2019 16:50
• URI: https://theses.gla.ac.uk/id/eprint/76092