Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 16: Elektromagnetische und Hadronische Proben

HK 16.1: Talk

Monday, March 7, 2005, 14:00–14:15, TU MA001

First measurement of helicity dependent photoabsorption cross sections on the neutron from 815 to 1825 MeV — •Jochen Krimmer — Physikalisches Institut der Universität Tübingen, Germany

Helicity dependent total photoabsorption cross sections on the deuteron have been measured for the first time at ELSA (Bonn) in the photon energy range from 815 to 1825 MeV. Circularly polarized tagged photons impinging on a longitudinally polarized LiD target have been used together with a highly efficient 4π detector system. The data around 1 GeV are not compatible with predictions from existing multipole analyses. From the measured energy range an experimental contribution to the GDH integral on the neutron of (33.9 ± 5.5(stat) ± 4.5(syst)) µb is extracted.