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The proton structure function F 2 (x, Q 2 ) is measured in inelastic QED Compton scattering using data collected with the H1 detector at HERA. QED Compton events are used to access the kinematic range of very low virtualities of the exchanged photon, Q 2 , down to 0.5 GeV 2 , and Bjorken x up to ∼0.06, a region which has not been covered previously by inclusive measurements at HERA. The results are in agreement with the measurements from fixed target lepton-nucleon scattering experiments.

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Cross sections of some n, n~-reactions have been investigated in the energy range of the neutrons from t2 to 19'6 MeV by measuring the radioactivities produced. Neutrons of these energies were produced by bombarding a thin tritium-target with 3 MeV-Deuterons. In all cases considered the cross section increases rapidly with the neutron energy. In addition some ~r 2n-reactions were studied in the same way; the results were compared with cross sections which were calculated according to the statistical theory.Einleitung