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Phys Rev Lett. 2005 Apr 29;94(16):162001. Epub 2005 Apr 28.

Measurement of helicity-dependent photoabsorption cross sections on the neutron from 815 to 1825 MeV.

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Physikalisches Institut, Universit├Ąt Bonn, D-53115 Bonn, 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 4pi 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)] microb is extracted.

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