Darmstadt 2008 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 2: Elektromagnetische und Hadronische Sonden
HK 2.7: Talk
Monday, March 10, 2008, 15:45–16:00, 1C
Novel Technique to Measure the Polarizability of the Nucleon* — •Olena Yevetska1, Juergen Ahrens3, Vladimir Chizhov2, Valeriy Iatsioura2, Evgeniy Maev2, Evgeniy Orishchin2, Gennadiy Petrov2, Achim Richter1, Gerhard Schrieder1, Lev Sergeev2, Yuriy Smirenin2, and Steffen Watzlawik1 — 1Institut für Kernphysik, Technische Universität Darmstadt, Germany — 2Petersburg Nuclear Physics Institute, Petersburg, Russia — 3Institut für Kernphysik, Johannes Gutenberg-Universität, Mainz, Germany
At the Superconducting Darmstadt electron linear accelerator S-DALINAC an experiment has been built to measure the electric and magnetic polarizability of the proton and the deuteron by low energy Compton scattering with the aim to determine the energy dependence of the differential cross sections of elastic γp/γd scattering at two angles in a model-independent way in the photon energy range 20-100 MeV with a precision < 1%. A narrow collimated bremsstrahlung photon beam enters two high pressure ionisation chambers filled with hydrogen, which act as target as well as detector gas. Two large volume NaI-spectrometers detect the Compton scattered photons under angles of 90° and 130° and serve as triggers for coincidence measurements of the recoiling nucleons in the chambers. First experiments were carried out using electron beams of 60 and 79 MeV, respectively.
Results based on pulse shape analysis will be presented.
*Supported by the DFG through SFB 634.