Nuclear structure and nuclear astrophysics experiments at the superconducting electron accelerator ELBE

The superconducting electron accelerator ELBE at Rossendorf delivers electron beams of energies up to 20 Me V with average currents up to 1 mA for experiments using photon-induced reactions. The Bremsstrahlung facility installed at this accelerator and the experimental area were designed such that the production of neutrons and the scattering of photons from surrounding materials are strongly reduced. We have investigated the nuclides 92Mo, 98Mo and 100Mo in photon-scattering experiments at electron energies from 6 to 13 Me V. Several hundred dipole transitions were observed in each of the nuclides. The experimental dipole-strength distributions of the nuclei are compared with calculations on the basis of a quasiparticle-random-phase approximation for deformed nuclei. Statistical approaches to the correction of level feeding and decay branches are presented. We have studied the 92Mo(γ, n). 92Mo(γ, p) and 92Mo(γ, a) reactions at various electron energies via photoactivation experiments. The deduced activation yields are compared with theoretical predictions. (authors)