Absolute transition probabilities inSm151

Lifetime measurements of the excited states of ${}_{}{}^{151}{}_{}{}^{}\mathrm{Sm}$ were carried out by delayed coincidence measurements between the $\beta$ spectrum of ${}_{}{}^{151}{}_{}{}^{}\mathrm{Pm}$ and the conversion lines that deexcite the levels in the self-comparison method, using a double-lens coincidence spectrometer. The mean lifetimes of the 344.9 keV and the 445.7 keV levels were determined as $\tau =13.4\mathrm{}\pm 3$ psec and 28.9 ± 4 psec, respectively. The spins of four states were determined from angular correlation measurements carried out for four cascades that deexcite the 344.9 keV state, utilizing two Ge(Li) detectors. The 27 $B\left(E1\mathrm{}\right)\mathrm{}$ and $B\left(M1\mathrm{}\right)\mathrm{}$ reduced transition probabilities deduced from the present work and from previous investigations were compared with the predictions of the Nilsson model.