COINCIDENCE MEASUREMENTS FOLLOWING THE ALPHA-DECAY OF CM-245

An investigation has been made into the population of states in Pu-241 following the alpha decay of Cm-245. These studies focused on the wea kly fed 1/2(+)[631] rotational band. States populated in this band are expected to decay by electromagnetic transitions to the band head 1/2 (+) state at an excitation energy of 161.7 keV. This state de-excites to the ground state of Pu-241 With a half-life of 0.88 mu s. The alpha -particle decay feeding these rotational band members was investigated by performing gamma-gamma and alpha-gamma coincidence experiments usi ng a 56.3 kBq Cm-245 radioactive source. The alpha population of the m ore strongly populated bands was also investigated, and resulted in tw o previously observed gamma rays being confidently placed within the P u-241 lever scheme. Four gamma rays that were previously unassigned ca n now be excluded from the alpha decay of Cm-245 as a consequence of t he present study.