Spin filtering neutrons with a proton target dynamically polarized using photo-excited triplet states

被引：18

作者：

Haag, M. ^{[1
]}

van den Brandt, B. ^{[1
]}

Eichhorn, T. R. ^{[1
,2
]}

Hautle, P. ^{[1
]}

Wenckebach, W. Th ^{[1
]}

机构：

[1] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[2] Ecole Polytech Fed Lausanne, Lab Funct & Metab Imaging, CH-1015 Lausanne, Switzerland

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2012年 / 678卷

基金：

瑞士国家科学基金会;

关键词：

Neutron polarization analysis; Spin filters; Dynamic nuclear polarization; Photo-excited triplet states; NUCLEAR-POLARIZATION; SINGLE-CRYSTALS; BEAM; SCATTERING; SUPERMIRRORS; TEMPERATURE; MOLECULES;

D O I：

10.1016/j.nima.2012.03.014

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

In a test of principle a neutron spin filter has been built, which is based on dynamic nuclear polarization (DNP) using photo-excited triplet states. This DNP method has advantages over classical concepts as the requirements for cryogenic equipment and magnets are much relaxed: the spin filter is operated in a field of 0.3 Tat a temperature of about 100 K and has performed reliably over periods of several weeks. The neutron beam was also used to analyze the polarization of the target employed as a spin filter. We obtained an independent measurement of the proton spin polarization of similar to 0.13 in good agreement with the value determined with NMR. Moreover, the neutron beam was used to measure the proton spin polarization as a function of position in the naphthalene sample. The polarization was found to be homogeneous, even at low laser power, in contradiction to existing models describing the photo-excitation process. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：91 / 97

页数：7

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