R&D on crystalline cells for 3He nuclear polarizers

自旋交换光泵浦（SEOP）的3He极化存在未知的温度依赖自旋弛豫。由于这种过度的自旋弛豫，SEOP的3He极化被限制在~80%。这种松弛的机制尚未揭示，但一项研究表明，过度松弛的来源主要是一种表面现象。3He气体通常被限制在一个经过特殊处理的干净玻璃电池中，未知的自旋弛豫可能与玻璃的多孔结构有关，其中3He原子渗透在玻璃壁中。为了研究温度依赖的自旋弛豫机制，克服3He极化的限制，进行了晶体电池的研究和开发。

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.