Buffer-Gas Loading and Magnetic Trapping of Atomic Europium

Atomic europium has been magnetically trapped using buffer-gas loading. Laser ablated $\mathrm{Eu}\left({}_{}{}^8{}_{}{}^{}S_{7/2}^{}{}_{}{}^{}\right)$ atoms are thermalized to 800 mK in a ${}^4\mathrm{He}$ buffer gas (to 250 mK in a ${}^3\mathrm{He}$ buffer gas). Anti-Helmholtz superconducting coils produce a quadrupole magnetic field to trap the $M_J=7\mathrm{}/2$ state of Eu. Detection is via absorption spectroscopy at 462.7 nm. Up to $1\times {10}^{12}\mathrm{Eu}$ atoms are loaded at a central density of $5\times {10}^{12}{\mathrm{cm}}^{-3\mathrm{}}$. Atoms can be held for longer than 100 s.