R&D on crystalline cells for 3He nuclear polarizers

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There is unknown temperature-dependent spin relaxation in the 3He polarization by the spin exchange optical pumping (SEOP). Due to this excess spin relaxation, the 3He polarization by the SEOP is limited up to ~80%. The mechanism of this relaxation is not yet revealed, but a study indicates that the source of the excess relaxation is primarily a surface phenomenon. The 3He gas is usually confined in a specially treated clean glass cell, and the unknown spin relaxation might be related with the porous structure of glass, where 3He atoms permeate in the glass walls. To study the mechanism of the temperature-dependent spin relaxation as well as to overcome the limitation of the 3He polarization, research and development of crystalline cells are performed.