scholarly journals Polarized proton spin filter for epithermal neutrons based on dynamic nuclear polarization using photo-excited triplet electron spins

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Shusuke Takada ◽  
Kenichiro Tateishi ◽  
Yasuo Wakabayashi ◽  
Yoshimasa Ikeda ◽  
Tamaki Yoshioka ◽  
...  
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Proton Spin ◽  
Beam Diameter ◽  
Electron Spins ◽  
Spin Filter ◽  
Neutron Polarization ◽  
Excited Triplet ◽  
Epithermal Neutrons ◽  
Polarized Proton

Abstract To polarize neutrons with energy beyond 0.1 eV, we developed a novel polarized proton spin filter based on dynamic nuclear polarization using photo-excited triplet electron spins. The spin filter consists of a single crystal of naphthalene doped with deuterated pentacene and has a size of $\varnothing15\times4 \, {\rm mm}^3$, allowing it to cover a wide beam diameter. It was operated in 0.35 T and at 90 K. We succeeded in polarizing neutrons in the energy range 0.1–10 eV using a RIKEN accelerator-driven compact neutron source. The averaged values of the proton and neutron polarization were $0.250\pm0.050$ and $0.076\pm0.015$, respectively.

Optimization of 1H spin density for dynamic nuclear polarization using photo-excited triplet electron spins

2009 ◽  
Vol 197 (1) ◽  
pp. 9-13 ◽  
Author(s):  
Akinori Kagawa ◽  
Yu Murokawa ◽  
Kazuyuki Takeda ◽  
Masahiro Kitagawa
Keyword(s):  
Spin Density ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Electron Spins ◽  
Excited Triplet

scholarly journals Dynamic Nuclear Polarization with Single Electron Spins

2008 ◽  
Vol 100 (6) ◽  
Author(s):  
J. R. Petta ◽  
J. M. Taylor ◽  
A. C. Johnson ◽  
A. Yacoby ◽  
M. D. Lukin ◽  
...  
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Single Electron ◽  
Electron Spins

Study of Chemically Induced Dynamic Nuclear Polarization of Aliphatic Aldehydes in D2O and other Solvents

1975 ◽  
Vol 53 (17) ◽  
pp. 2548-2557 ◽  
Author(s):  
Holger E. Chen ◽  
Michael Cocivera ◽  
Shiv P. Vaish
Keyword(s):  
Triplet State ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Hydrogen Abstraction ◽  
The Other ◽  
Excited Triplet State ◽  
Relative Importance ◽  
Aliphatic Aldehydes ◽  
Excited Triplet ◽  
Chemically Induced

The chemically induced dynamic nuclear polarization arising from irradiation of aliphatic aldehydes in D2O and various other solvents is reported. The aldehydes included acetaldehyde, propionaldehyde, isobutyraldehyde, and pivalaldehyde, and the solvents were benzene, acetonitrile, cyclohexane, methylcyclohexane, perfluoromethylcyclohexane, D2O, and D2O/acetonitrile. For propionaldehyde, the variation of c.i.d.n.p. with solvent can be explained by a variation of the relative importance of α-cleavage vs. hydrogen abstraction which occur via an excited triplet state. In addition, when D2O is the solvent, the c.i.d.n.p. provides information about secondary radical reactions not observed in the other solvents. For the other aldehydes, the nature of the solvent does not seem to affect the relative importance of α-cleavage vs. hydrogen abstraction. Acetaldehyde undergoes hydrogen abstraction whereas isobutyraldehyde and pivalaldehyde undgero α-cleavage via an excited triplet state.

Dynamic nuclear polarization by photoexcited-triplet electron spins in polycrystalline samples

2001 ◽  
Vol 345 (1-2) ◽  
pp. 166-170 ◽  
Author(s):  
Kazuyuki Takeda ◽  
K. Takegoshi ◽  
Takehiko Terao
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Electron Spins

Dynamic nuclear polarization studies of intermolecular coupling of deuteron and unpaired electron spins

1973 ◽  
Vol 59 (6) ◽  
pp. 3031-3037 ◽  
Author(s):  
Richard D. Bates ◽  
Edward H. Poindexter ◽  
Burkhard E. Wagner
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Unpaired Electron ◽  
Nuclear Polarization ◽  
Electron Spins ◽  
Polarization Studies ◽  
Intermolecular Coupling

scholarly journals Polarized neutron Laue diffraction on a crystal containing dynamically polarized proton spins

2013 ◽  
Vol 46 (1) ◽  
pp. 30-34 ◽  
Author(s):  
F. M. Piegsa ◽  
M. Karlsson ◽  
B. van den Brandt ◽  
C. J. Carlile ◽  
E. M. Forgan ◽  
...  
Keyword(s):  
Nuclear Polarization ◽  
Signal To Noise Ratio ◽  
Magnesium Nitrate ◽  
Proton Spin ◽  
Laue Diffraction ◽  
Nitrate Hydrate ◽  
Spin Disorder ◽  
Polarized Proton ◽  
Polarized Neutron ◽  
Diffraction Patterns

A polarized neutron Laue diffraction experiment on a single crystal of neodymium-doped lanthanum magnesium nitrate hydrate containing polarized proton spins is reported. By using dynamic nuclear polarization to polarize the proton spins, it is demonstrated that the intensities of the Bragg peaks can be enhanced or diminished significantly, whilst the incoherent background, due to proton spin disorder, is reduced. It follows that the method offers unique possibilities to tune continuously the contrast of the Bragg reflections and thereby represents a new tool for increasing substantially the signal-to-noise ratio in neutron diffraction patterns of hydrogenous matter.

Dynamic Nuclear Polarization using Photoexcited Triplet Electron Spins in Eutectic Mixtures

2018 ◽  
Vol 122 (50) ◽  
pp. 9670-9675 ◽  
Author(s):  
Akinori Kagawa ◽  
Makoto Negoro ◽  
Ryohei Ohba ◽  
Naoki Ichijo ◽  
Kota Takamine ◽  
...  
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Electron Spins ◽  
Eutectic Mixtures

scholarly journals Polarization analysis in neutron small-angle scattering with a novel triplet dynamic nuclear polarization spin filter

2015 ◽  
Vol 48 (5) ◽  
pp. 1514-1521 ◽  
Author(s):  
N. Niketic ◽  
B. van den Brandt ◽  
W. Th. Wenckebach ◽  
J. Kohlbrecher ◽  
P. Hautle
Keyword(s):  
Neutron Scattering ◽  
Dynamic Nuclear Polarization ◽  
Small Angle ◽  
Nuclear Polarization ◽  
Spherical Particles ◽  
Neutron Spin ◽  
Triplet States ◽  
Spin Filter ◽  
Angle Scattering ◽  
Close Distance

A novel neutron spin filter whose principle is based on the strong spin dependence of the neutron scattering on protons has been developed. The dimensions of this filter are small, and it works very efficiently and is stable even in inhomogeneous fields. The protons in the naphthalene spin filter crystal are polarized by a recently developed method of dynamic nuclear polarization using photoexcited triplet states. This technique allows the design of a very compact apparatus that can be placed at a close distance to the sample under investigation. The application of this filter as a polarization analyzer is demonstrated in a magnetic small-angle neutron scattering experiment with the measurement of the spin-dependent scattering signals of a CuFeNi alloy. This sample has a pronounced textured structure factor of ferromagnetic precipitates in a paramagnetic matrix. The performance of the spin filter as an analyzer is illustrated by the excellent agreement of the experimental data with simulations based on a model of homogeneously magnetized spherical particles which are ordered in a simple cubic paracrystalline lattice.

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