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Phys. Rev. A 77, 053408 (2008) [5 pages]

Relaxation of spin polarized 3He in mixtures of 3He and 4He below the 4He lambda point

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Q. Ye, D. Dutta, H. Gao, K. Kramer, X. Qian, and X. Zong
Triangle Universities Nuclear Laboratory and Department of Physics, Duke University, Durham, North Carolina 27708, USA

L. Hannelius, R. D. McKeown, B. Heyburn, and S. Singer
Kellogg Radiation Laboratory and Department of Physics, California Institute of Technology, Pasadena, California 91125, USA

R. Golub
Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA

E. Korobkina
Department of Nuclear Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA

Received 7 April 2008; published 20 May 2008

We report a first study of the depolarization behavior of spin polarized 3He in a mixture of 3He-4He at a temperature below the 4He λ 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 of ∼3000 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)×10−7 for polarized 3He in the superfluid 4He from a dTPB-dPS coated acrylic surface.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.77.053408
DOI:
10.1103/PhysRevA.77.053408
PACS:
33.25.+k, 34.35.+a, 07.20.Mc, 67.25.bh
 
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