München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 21: Postersitzung
HK 21.5: Poster
Dienstag, 21. März 2006, 15:30–17:00, P
Novel Technique to Measure Polarizability of the Nucleon∗ — •O. Yevetska1, J. Ahrens2, V. Chizhov3, V. Iatsioura3, E. Maev3, G. Petrov3, I. Petermann1, A. Richter1, G. Schrieder1, L. Sergeev3, Y. Smirenin3, and S. Watzlawik1 — 1Institut für Kernphysik, Technische Universität Darmstadt, Germany — 2Institut für Kernphysik, Johannes Gutenberg-Universität, Mainz, Germany — 3Petersburg Nuclear Physics Institute, Petersburg, Russia
At the Superconducting DArmstadt electron LINear ACcelerator S-DALINAC an experiment was built up to measure the electric and magnetic polarizability of the proton and the deuteron by low energy Compton scattering. A novel experimental method is used for an energy dependent determination of the differential cross section at two angles of elastic γ p/γd scattering 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 (deuterium), which acts as target as well as detector gas. Two large volume NaI-spectrometers detect the Compton scattered photons under two angles ( 90∘, 130∘ ) and serve as triggers for coincidence measurements of the recoiling nucleons in the chambers.
In first measurements the experimental setup and the method have been tested. The measured Compton scattered coincident photons counting rate is in good agreement with detailed Monte-Carlo-simulations (GEANT4). The experiment is ready for taking data with high statistical precision.
*Supported by the DFG through SFB 634.