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HK: Hadronen und Kerne
HK 4: Electromagnetic Probes I, Photoproduction
HK 4.5: Talk
Monday, March 16, 1998, 15:45–16:00, B
Measurement of total photohadronic cross sections with the GDH-Detector at ELSA — •M. Sauer1, G. Anton2, A. Bock2, P. Grabmayr1, K. Helbing2, H. Holvoet3, B. Kiel2, B. Lannoy3, R. Lauscher2, T. Michel2, D. Ryckbosch3, R. Van De Vyver3, R. Weigelt4, and L. Weitemeyer1 — 1Physikalisches Institut, Universit"at Tübingen — 2Physikalisches Institut, Universit"at Erlangen-N"urnberg — 3Department of Subatomic and Radiation Physics RUG, Gent, Belgium — 4Physikalisches Institut, Universit"at Bonn
The experimental examination of the Gerasimov-Drell-Hearn sum rule requires the measurement of the spin dependence of the total hadronic photoabsorption cross section over a wide range of photon energies. Therefore measurements will be carried out at MAMI and ELSA which will cover the photon energie region of 140 MeV - 3000 MeV.
In order to test the new GDH-Detector and to study sources of systematic
uncertainties a pilot experiment was performed.
In this experiment the unpolarised total hadronic photoabsorption cross
sections on 12C, 1H, 2H and the neutron were determined
in an energy range of 240 MeV ≤ Eγ ≤ 1140 MeV.
The good agreement of the measured excitation functions with published data
proofs the suitability of the GDH-detector for the actual GDH-experiments
at ELSA.
The experimental setup, the method of data analysis and final results
will be presented.
supported by BMBF(06T"u669) and DFG(Mu705/3,Graduiertenkolleg)