Work

Relaxation of spin polarized H3e in mixtures of H3e and H4e below the H4e lambda point

Year: 2008

Type: article

Abstract: We report a first study of the depolarization behavior of spin polarized $^{3}\text{H}\text{e}$ in a mixture of $^{3}\text{H}\text{e-}^{4}\text{H}\text{e}$ at a temperature below the $^{4}\text{H}\text{e}$ $\ensuremath{\lambda}$ point in a deuterated tetraphenyl butadiene-doped deuterated polystyrene (dTPB-dPS) coated acrylic cell. In our experiment the measured $^{3}\text{H}\text{e}$ relaxation time is due to the convolution of the $^{3}\text{H}\text{e}$ longitudinal relaxation time, ${T}_{1}$, and the diffusion time constant of $^{3}\text{H}\text{e}$ in superfluid $^{4}\text{H}\text{e}$ since depolarization takes place on the walls. We have obtained a $^{3}\text{H}\text{e}$ relaxation time of $\ensuremath{\sim}3000\text{ }\text{s}$ at a temperature around 1.9 K. We have shown that it is possible to achieve values of wall depolarization probability on the order of $(1--2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$ for polarized $^{3}\text{H}\text{e}$ in the superfluid $^{4}\text{H}\text{e}$ from a dTPB-dPS coated acrylic surface.

Source: Physical Review A

DOI: 10.1103/physreva.77.053408