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We have measured the ratio of the diffusion cross-section to the angularmomentum reorientation cross-section in the colliding Fe-3He and Ni-3Hesystems. Nickel (Ni) and iron (Fe) atoms are introduced via laser ablation intoa cryogenically cooled experimental cell containing cold (< 1 K) 3He buffergas. Elastic collisions rapidly cool the translational temperature of theablated atoms to the helium temperature. The cross-section ratio is extractedby measuring the decays of the atomic Zeeman sublevels. For our experimentalconditions, thermal energy is comparable to the Zeeman splitting. As a result,thermal excitations between Zeeman sublevels significantly impact the observeddecay. To determine the cross-section ratio accurately, we introduce a model ofZeeman state dynamics that includes thermal excitations. We find thecross-section ratio for Ni-3He = 5 x 10^3 and Fe-3He <= 3 x 10^3 at 0.75 K in a0.8 T magnetic field. These measurements are interpreted in the context ofsubmerged shell suppression of spin relaxation as studied previously intransition metals and rare earth atoms.

Zeeman Relaxation of Cold Atomic Iron and Nickel in Collisions with 3He