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We report on hyperpolarization of quadrupolar (I=3/2) 131Xe via spin-exchangeoptical pumping. Observations of the 131Xe polarization dynamics show that theeffective alkali-metal/131Xe spin-exchange cross-sections are large enough tocompete with 131Xe spin relaxation. 131Xe polarization up to 7.6 p/m 1.5percent was achieved in ca. 8.5EE20 spins--a ca. 100-fold improvement in thetotal spin angular momentum--enabling applications including measurement ofspin-dependent neutron-131Xe s-wave scattering and sensitive searches fortime-reversal violation in neutron-131Xe interactions beyond the StandardModel.

Two-Orders-of-Magnitude Improvement in the Total Spin Angular Momentum of 131Xe Nuclei Using Spin Exchange Optical Pumping