Fine Studies of Proton Radioactivity with Digital Signal Processing

Recent proton radioactivity studies at tile Holifield Radioactive Ion Beam Facility at Oak Ridge are presented. The experiments were performed by means of a Recoil Mass Separator (RMS) and digital processing of its detector signals. Observation of fine structure in proton emission from the activities : Tm-145 (T-1/2 approximate to 3 mus) and Tm-146m,Tm-gs (T-1/2 approximate to 200 ms and 100 ms, respectively) is reported. The structure of the proton emitting states is analyzed in terms of a spherical approach. The properties of daughter states, a 2(+) state in Er-144 and the s(1/2) and h(11/2) neutron levels in Er-145, are deduced.