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The comparison of the free precession of co-located 3He-129Xe spins (clockcomparison) enables us to search for very tiny nonmagnetic spin interactions.With our setup we could establish new limits for Lorentz invariance violatinginteractions of spins with a relic background field which permeates theUniverse and points in a preferred direction in space.

Probing Physics beyond the Standard Model with He/Xe clock comparison experiments