自旋极化$^3$ He在$^3$ He和$^4$ He混合物中在$^4$ He λ点以下的弛豫
Relaxation of Spin Polarized $^3$He in Mixtures of $^3$He and $^4$He Below the $^4$He Lambda Point
摘要：
本文首次报道了在氘代四苯基丁二烯掺杂的氘代聚苯乙烯（dTPB-dPS）涂层丙烯酸电池中，在低于4 He λ点的温度下，自旋极化的3 He在3 He-4 He混合物中的退极化行为。在我们的实验中，测量到的3 He弛豫时间是由于3 He的纵向弛豫时间T1和3 He在超流4 He中的扩散时间常数的卷积，因为去极化发生在壁上。在1.9K附近得到了~ 3 He的弛豫时间~3000秒。我们已经证明，在dTPB-dPS涂层的丙烯酸表面的超流4 He中，对于极化的3 He，有可能获得（1-2）x10^-7量级的壁面退极化概率值。
英文摘要：
We report the first study of the depolarization behavior of spin polarized 3He in a mixture of 3He-4He at a temperature below the 4He Lambda point in a deuterated TetraPhenyl Butadiene-doped deuterated PolyStyrene (dTPB-dPS) coated acrylic cell. In our experiment the measured 3He relaxation time is due to the convolution of the 3He longitudinal relaxation time, T1, and the diffusion time constant of 3He in superfluid 4He since depolarization takes place on the walls. We have obtained a 3He relaxation time ~3000 seconds at a temperature around 1.9K. We have shown that it's possible to achieve values of wall depolarization probability on the order of (1-2)x10^-7 for polarized 3He in the superfluid 4He from a dTPB-dPS coated acrylic surface.
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