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dc.contributor.advisorWatts, Danielen
dc.contributor.advisorBashkanov, Mikhailen
dc.contributor.authorKay, Stephen John Donalden
dc.date.accessioned2018-08-29T10:25:55Z
dc.date.available2018-08-29T10:25:55Z
dc.date.issued2018-11-29
dc.identifier.urihttp://hdl.handle.net/1842/31525
dc.description.abstractThis thesis presents the first measurement of the d*(2380) (hexaquark) electromagnetic coupling, extracted from the deuteron photodisintegration (~γd → d* →~np) reaction. The experiment was carried out at the Mainzer Microtron (MAMI) facility in the Institut für Kernphysik in Mainz, Germany. A racetrack microtron at the MAMI facility provided a 1557 MeV longitudinally polarised electron beam. This electron beam was directed onto a thin radiator to produce a bremsstrahlung photon beam. Diamond and amorphous (metallic) radiators were used to produce linearly and circularly polarised photons respectively. The produced bremsstrahlung photon beam was energy 'tagged' with a resolution of ~4 MeV over the photon-energy range of 150-1400 MeV using the Glasgow Photon Tagger. The tagged photons were incident on a 10 cm long liquid deuterium target. This target was surrounded by a new nucleon recoil polarimeter apparatus and placed within the Crystal Ball calorimeter at MAMI. An array of PbWO4 and BaF2 detectors (TAPS) was used to provide calorimetry at forward angles. The newly constructed large acceptance recoil polarimeter measures the polarisation of the nucleons in the final state. The combination of this new apparatus with the polarised photon beam facility gives access to a number of single and double polarisation observables. The photon beam asymmetry, Ʃ, and the double polarisation observable, Cx' , were examined in measurements of the reaction d(→γ,→n→p) over a large range of energies with a close to full angular coverage. The observable Cx' is determined for the neutron produced in deuteron photodisintegration for the first time. The new data constrains mechanisms of deuteron photodisintegration and assesses the existence and contribution of the d*(2380) resonance.en
dc.contributor.sponsorScience and Technology Facilities Council (STFC)en
dc.language.isoen
dc.publisherThe University of Edinburghen
dc.relation.hasversionStephen Kay for the A2 Collaboration. https://github.com/sjdkay/ a2geant/tree/GEANT4.10_Polarimeter. Accessed 26/03/2018.en
dc.relation.hasversionStephen Kay. https://github.com/sjdkay/a2GoAT/blob/NewGoATWork/ src/PNeutPol.cc. Accessed 08/04/2018.en
dc.relation.hasversionStephen Kay. https://github.com/sjdkay/a2GoAT/tree/NewGoATWork/ Analysis_Macros. Accessed 08/04/2018.en
dc.subjectHadron Physicsen
dc.subjectExotic Hadronsen
dc.subjectMAMIen
dc.subjectCrystal Ballen
dc.subjectpolarimeteren
dc.subjectpolarimetryen
dc.subjectDeuterium Photodisintegrationen
dc.titleFirst investigation of electromagnetic coupling of the d*(2380) hexaquarken
dc.typeThesis or Dissertationen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePhD Doctor of Philosophyen


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