Demonstration of the use of polarised 3He as a broadband polariser on a pulsed time-of-flight neutron source

被引：15

作者：

Boag, S. ^{[1
]}

Parnell, S. R.

Frost, C. D.

Andersen, K. H.

Babcock, E.

机构：

[1] Rutherford Appleton Lab, ISIS, Didcot OX11 0QX, Oxon, England

[2] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

来源：

PHYSICA B-CONDENSED MATTER | 2007年 / 397卷 / 1-2期

基金：

英国工程与自然科学研究理事会; 英国科学技术设施理事会;

关键词：

polarised neutrons; neutron spin filter;

D O I：

10.1016/j.physb.2007.02.054

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We discuss the use of a new test beamline on the ISIS time-of-flight neutron source where the pressure, polarisation and relaxation time of spin-polarised He-3 neutron spin filter (NSF) cells can be determined. The beamline consists of a He-3 cell held in a magnetostatic cavity and a He-3 monitor in which the change in neutron transmission due to the highly spin-dependent cross-section of He-3 is measured. The neutron polarisation is simultaneously confirmed using the asymmetry method, through the use of a Heusler crystal analyser and Mezei flipper. The beamline is routinely used in the characterisation of He-3 (NSF) cells and polarisations of up to 70% in sealed spin exchange optically pumped cells have been measured using both techniques. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：179 / 181

页数：3

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