Efficient Collection of221Fr into a Vapor Cell Magneto-optical Trap

Abstract
We have efficiently loaded a vapor cell magneto-optical trap from an orthotropic source of 221Fr with a trapping efficiency of 56(10)%. A novel detection scheme allowed us to measure 900 trapped atoms with a signal to noise ratio of 60 in 1 sec. We have measured the energies and the hyperfine constants of the 7P1/22 and 7P3/22 states.