Energy levels in Cf-251(98) populated in the alpha decay of Fm-255(100) - art. no. 064302

Gamma-ray spectra of a 20-h Fm-255 source containing similar to1 mCi activi ty were measured with a 25% Ge detector and a low-energy photon spectromete r (LEPS). Gamma lines with intensities as low as 1.0 x 10(-6)% per 255Fm, d ecay were observed. Gamma-gamma coincidence spectra of a Fm-255 Sample were measured with the GAMMASPHERE array. A comparison of the gamma -ray spectr um gated by the Cf K alpha x-ray peak with the gamma -singles spectrum prov ided spins of the excited states in Cf-251. The gamma -ray data, in conjunc tion with previously measured Cf-250(d,p) reaction data, allowed us to char acterize several single-particle and vibrational states above the N = 152 s ubshell gap.