Münster 2011 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 17: Hadronenstruktur und -spektroskopie V

HK 17.3: Vortrag

Dienstag, 22. März 2011, 14:45–15:00, C-2

Spin Observables in Compton Scattering with the CB@MAMI Detector System. — •Evangeline Joy Downie — Institut für Kernphysik, Universität Mainz, Mainz, Germany

The study of spin observables in Compton scattering allows access to the vector polarisabilities of the nucleon. These observables, which describe the dynamic response of the nucleon to a changing electromagnetic field, are often predicted by theory, but have never before been independently accessed by experiment due to the technical difficulty involved.

With the advent of the new Mainz Frozen Spin Target, affording average target polarisations of above 70% with relaxation time in excess of 1000 hours, in combination with the Mainz 4 pi detector system and the high quality polarised photon beam resulting from the combination of the Glasgow Tagged Photon Spectrometer and the MAMI C 1.557 GeV electron beam, these technical challenges can be overcome.

We will give an introduction to the measurement of Spin Polarisabilities through Compton Scattering and a brief overview of the detector setup, comprising of the Crystal Ball (672 element NaI spectrometer), TAPS (384 element BaF2 spectrometer), two Multi Wire Proportional Chambers for charged particle tracking and the Particle Identification Detector (a 24 strip plastic barrel detector) for charged particle identification. The current status of the experiment and recent results will be discussed and an future outlook will be presented.