Energy levels of 247Cm populated in the α decay of 25198Cf -: art. no. 044306

alpha-Particle, conversion-electron, and gamma-ray singles spectra of Cf-251 sources containing few Bq activities were measured with high-resolution semiconductor detectors. alpha-gamma coincidence and level half-life measurements were also performed. On the basis of these measurements the following single-particle states have been identified in Cm-247: 9/2(-)[734], 0 keV; 5/2(+)[622], 227.4 keV; 7/2(+)[624], 285.4 keV; 1/2(+)[620], 404.9 keV; 1/2(+)[631], 518.6 keV. The measured single-particle energies are in good agreement with energies calculated with a Woods-Saxon single-particle potential. From the measured half-life of the 227.4-keV level and the E3 branching ratio, a B(E3) value of 5 W.u. has been deduced between the 5/2(+)[622] and 9/2(-)[734] bands. The large B(E3) value is an indication of octupole mixing in the 227.4-keV level.