On the enhanced E1 transitions in the K = 3/2 parity doublet band in$^{223}$Ra

We have applied the fast timing $ \beta\gamma\gamma (t)$ technique to remeasure lifetimes of selected states in$^{223}$Ra populated in the $ \beta^{-}$ decay of$^{223}$Fr. $ T_{1/2}=587(12)$ ps and 210(13)ps have been obtained for the $ 3/2^{-}$ and $ 5/2^{-}$ states at 50.1 and 79.7 keV, that are more accurate than the previous values of 630(70)ps and 166(55)ps, respectively. Our $ \vert D_{0}\vert$ value of 0.155(10)e·fm obtained for the $ K=3/2$ configuration together with the available values of $ \vert D_{0}\vert$ for the $ K=1/2$ and $ K=5/2$ parity doublet bands establish the configuration dependence of $ \vert D_{0}\vert$ at low spins in this nucleus. Results of theoretical calculations performed for$^{223}$Ra, using the quasiparticle-phonon model (QPM) with inclusion of the Coriolis coupling, reasonably well reproduce octupole correlations in this nucleus.