A facility for studies of giant multipole resonances by fast heavy ion scattering

Abstract A technique to study giant resonances by heavy-ion scattering in the energy range 100 A –470 A MeV using one quadrant of the CELSIUS storage ring as a spectrometer is presented. A test experiment using 250 A MeV 16 O on a 40 Ar target has been performed. The inelastically scattered particles could be separated from the background originating from the beam halo using a focal-plane telescope in coincidence with neutron detectors around the target. The resolution in the excitation-energy spectrum was 3.5±0.5 MeV, mainly determined by the beam size at the target.