| Popis: |
Directional correlation measurements have been made on the 320- to 92-kev and 280-to 320-kev gamma-ray cascades in ${\mathrm{Pm}}^{147}$ following the decay of 11.1-day ${\mathrm{Nd}}^{147}$ with a coincidence scintillation spectrometer using NaI detectors. The observed correlation functions are: $W(\ensuremath{\theta})=1\ensuremath{-}(0.1030\ifmmode\pm\else\textpm\fi{}0.0298)$ ${P}_{2}(cos\ensuremath{\theta})+(0.0107\ifmmode\pm\else\textpm\fi{}0.0099)$ ${P}_{4}(cos\ensuremath{\theta})$, and $W(\ensuremath{\theta})=1+(0.0710\ifmmode\pm\else\textpm\fi{}0.0162)$ ${P}_{2}(cos\ensuremath{\theta})\ensuremath{-}(0.0126\ifmmode\pm\else\textpm\fi{}0.0103)$ ${P}_{4}(cos\ensuremath{\theta})$, respectively, for the two cascades. The energy levels of ${\mathrm{Pm}}^{147}$ at ground state, 92 kev, 410 kev, and 690 kev were found to be ${\frac{7}{2}}^{+}$, ${\frac{7}{2}}^{+}$, ${\frac{7}{2}}^{+}$, and ${\frac{5}{2}}^{+}$, respectively. It was found that the 92-kev gamma ray has a mixture of (95\ifmmode\pm\else\textpm\fi{}2)% $M1$ and (5\ifmmode\pm\else\textpm\fi{}2)% $E2$ with ${\ensuremath{\delta}}_{92}=+(0.229\ifmmode\pm\else\textpm\fi{}0.143)$, the 320-kev gamma ray has a mixture of 1% $M1$ and 99% $E2$ with ${\ensuremath{\delta}}_{320}=+9.95\ifmmode\pm\else\textpm\fi{}0.11$, and the 280-kev gamma ray has a mixture of 99% $M1$ and 1% $E2$ with ${\ensuremath{\delta}}_{280}=\ensuremath{-}0.11\ifmmode\pm\else\textpm\fi{}0.11$. |
