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We demonstrate a new technique to prepare an offline source of francium fortrapping in a magneto-optical trap. Implanting a radioactive beam of$^{225}$Ac, $t_{1/2} = 9.920(3)$ days, in a foil, allows use of the decayproducts, i.e.$^{221}$Fr, $t_{1/2} = 288.0(4)$ s. $^{221}$Fr is ejected fromthe foil by the $\alpha$ decay of $^{225}$Ac. This technique is compatible withthe online accumulation of a laser-cooled atomic francium sample for a seriesof planned parity non-conservation measurements at TRIUMF. We obtain a 34%release efficiency for $^{221}$Fr from the recoil source based on particledetector measurements. We find that laser cooling operation with the source is$8^{+10}_{-5}$ times less efficient than from a mass-separated ion beam of$^{221}$Fr in the current geometry. While the flux of this source is two tothree orders of magnitude lower than typical francium beams from ISOLfacilities, the source provides a longer-term supply of francium for offlinestudies.

Offline trapping of $^{221}$Fr in a magneto-optical trap from implantation of an $^{225}$Ac ion beam