Limits to the polarization for spin-exchange optical pumping of 3He

被引：64

作者：

Babcock, E

Chann, B

Walker, TG

Chen, WC

Gentile, TR

机构：

[1] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[2] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA

[3] Indiana Univ, Bloomington, IN 47408 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.96.083003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Based on measurements of the temperature dependence of He-3 relaxation in a wide range of spin-exchange optical pumping cells, we report evidence for a previously unrecognized surface relaxation process. The relaxation rate was found to be linearly proportional to the alkali-metal density with a slope that exceeds the spin-exchange rate, which limits the polarization for current applications, including neutron spin filters, polarized targets, and polarized gas magnetic resonance imaging. We find that the magnitude of this excess relaxation can vary widely between cells, and that the variation is larger for cells of higher surface to volume ratio. We have observed He-3 polarization as high as 81%, but further improvements require understanding the origin of this relaxation.

引用

页数：4

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