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The magnetic dipole moments and changes in mean-square charge radii of theneutron-rich $^{218m,219,229,231}\text{Fr}$ isotopes were measured with thenewly-installed Collinear Resonance Ionization Spectroscopy (CRIS) beam line atISOLDE, CERN, probing the $7s~^{2}S_{1/2}$ to $8p~^{2}P_{3/2}$ atomictransition. The $\delta\langle r^{2}\rangle^{A,221}$ values for$^{218m,219}\text{Fr}$ and $^{229,231}\text{Fr}$ follow the observed increasingslope of the charge radii beyond $N~=~126$. The charge radii odd-evenstaggering in this neutron-rich region is discussed, showing that$^{220}\text{Fr}$ has a weakly inverted odd-even staggering while$^{228}\text{Fr}$ has normal staggering. This suggests that both isotopesreside at the borders of a region of inverted staggering, which has beenassociated with reflection-asymmetric shapes. The $g(^{219}\text{Fr}) =+0.69(1)$ value supports a $\pi 1h_{9/2}$ shell model configuration for theground state. The $g(^{229,231}\text{Fr})$ values support the tentative$I^{\pi}(^{229,231}\text{Fr}) = (1/2^{+})$ spin, and point to a $\pis_{1/2}^{-1}$ intruder ground state configuration.

Laser spectroscopy of francium isotopes at the borders of the region of reflection asymmetry