Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 754, Issue -, Pages 10-14Publisher
ELSEVIER
DOI: 10.1016/j.nima.2014.03.047
Keywords
Neutron polarization analysis; Spin filters; Dynamic nuclear polarization; Photo-excited triplet states; Neutron optics
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Funding
- Swiss National Science Foundation [200020_144424, 200021_143297]
- Swiss National Science Foundation (SNF) [200020_144424, 200021_143297] Funding Source: Swiss National Science Foundation (SNF)
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The use of polarized protons as neutron spin filter is an attractive alternative to the well established neutron polarization techniques, as the large, spin-clepenclent neutron scattering cross-section for protons is useful up to the sub-MeV region. Employing optically excited triplet states for the dynamic nuclear polarization (DNP) of the protons relieves the stringent requirements of classical DNP schemes, i.e low temperatures and strong magnetic fields, making technically simpler systems with open geometries possible. Using triplet DNP a record polarization of 71% has been achieved in a pentacene doped naphthalene single crystal at a held of 0.36 T using a simple helium flow cryostat for cooling. Furthermore, by placing the polarized crystal in a neutron optics focus and de-focus scheme, the actual sample cross-section could be increased by a factor 35 corresponding to an effective spin filter cross-section of 18 x 18 mm(2). (C) 2014 Elsevier B.V. All rights reserved.
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