HIGH-ENERGY RESOLUTION ION-BEAM TECHNIQUES FOR NOVEL INVESTIGATIONS IN NUCLEAR, ATOMIC AND APPLIED PHYSICS USING NARROW NUCLEAR RESONANCES

The 400 kV accelerator at the Universitat Munster has been improved to provide intense ion beams with high energy resolution. Gas and-vapor targets required for high resolution experiments have been built. The energy scanning and data acquisition during the experiment was controlled by a computer. With this system an overall resolution of less than 25 eV for proton beams in the 100 muA range was achieved. The properties of this system are described. Using this system the width of nuclear resonances were determined to values as low as 3 eV. Such narrow resonances were also used as probes to investigate the influence of the nuclear environment on the yield curves. For example, replica resonances corresponding to atomic excitation of the electronic shells of the compound atom were observed, and a strong Lewis effect was measured for both solid and gas targets.