“…to excited states in the decays of 7Be (Lancman and Lebowitz, 1971a;Persson and Koonin, 1972), 51Cr (Koonin and Persson, 1972); 54Mn (Lancman and Lebowitz,*1969;Kidr et al, 1970;Koonin and Persson, 1972), 57Cd (Lancman and Lebowitz, 1971b), and S3sn (Bosch et al, 1967). The main difficulty in IB-Y coincidence spectrometry arises from the large difference in intensity (Mi0) between IB and y radia tion, because the y-ray spectra usually cover the same energy range as the weak IB spectra.…”