Measurements of multipolarities in 225Ra

Multipolarities of 45 transitions in 225Ra have been established by investigating the radiations associated with the β- decay of 225Fr. The study includes β-, e- and γ-singles spectra, e-γ- and γγ-coincidence measurements. The conversion electrons were measured with a mini-orange electron spectrometer, and the γ-spectra with Ge detectors. The multipolarities obtained from the measured conversion coefficients support the assignments of spin-parity doublets thus giving evidence for a stable octupole deformation of this nucleus. The negative parity of the 394.2 keV level established in the present work indicates that this level is a candidate for the parity-doublet partner of the 5/2+ state at 236.3 keV. (orig.)