The 3He polarizing filter on the neutron reflectometer D17

Andersen, K.H.; Cubitt, R.; Humblot, H.; Jullien, D.; Petoukhov, A.; Tasset, F.; Schanzer, Christian; Shah, Vaishali; Wildes, A.

doi:10.1016/j.physb.2006.05.391

Cited by 25 publications

(21 citation statements)

References 5 publications

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“…They include magnetic resonance imaging, spin-polarized targets, surface science, probing of biological systems, and precision measurements in fundamental physics [1][2][3][4][5][6][7][8][9][10]. One of the unique properties of polarized 3 He is the very long spinrelaxation time constant which can be of the order of thousands of hours [11,12], making polarized 3 He extremely sensitive to any spin-dependent interaction.…”

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confidence: 99%

PolarizedHe3as a Probe for Short-Range Spin-Dependent Interactions

Petukhov¹,

Pignol²,

Jullien³

et al. 2010

Phys. Rev. Lett.

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124

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We have studied the relaxation of a spin-polarized gas in a magnetic field, in the presence of short-range spin-dependent interactions. As a main result we have established a link between the specific properties of the interaction and the dependence of the spin-relaxation rate on the magnitude of the holding magnetic field. This allows us to formulate a new, extremely sensitive method to study (pseudo) magnetic properties at the submillimeter scale, which are difficult to access by other means. The method has been used as a probe for nucleon-nucleon axionlike P, T violating interactions which yields a two-order-of-magnitude improved constraint on the coupling strength (g(s)g(p)) as a function of the force range (λ): g(s)g(p)λ² < 3×10⁻²⁷ m².

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confidence: 99%

PolarizedHe3as a Probe for Short-Range Spin-Dependent Interactions

Petukhov¹,

Pignol²,

Jullien³

et al. 2010

Phys. Rev. Lett.

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124

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“…MEOP polarizes pure 3 He at low pressure, typically 1 mbar, at rates of about 1 bar-l=h with 3 He polarizations of 70% or more [5]. MEOP polarizer stations compress the 3 He into cells that are transported to the point of use, where the 3 He polarization decays very slowly, with a time constant that can be a week or longer [6]. For SEOP, the 3 He is polarized by the hyperfine interaction during collisions of the 3 He nuclei with polarized valence electrons of optically pumped alkali metals.…”

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confidence: 99%

Neutron Beam Effects on Spin-Exchange-PolarizedHe3

et al. 2008

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We have observed depolarization effects when high intensity cold neutron beams are incident on alkali-metal spin-exchange-polarized 3He cells used as neutron spin filters. This was first observed as a reduction of the maximum attainable 3He polarization and was attributed to a decrease of alkali-metal polarization, which led us to directly measure alkali-metal polarization and spin relaxation over a range of neutron fluxes at Los Alamos Neutron Science Center and Institute Laue-Langevin. The data reveal a new alkali-metal spin-relaxation mechanism that approximately scales as sqrt[phi_{n}], where phi_{n} is the neutron capture-flux density incident on the cell. This is consistent with an effect proportional to the concentration of electron-ion pairs but is much larger than expected from earlier work.

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“…Figure 1(a) shows the measured polarized neutron OSS image in the I −+ spin-flip channel for an Fe/Si multilayer of 30 bilayers with a thickness of 10 nm, which was fabricated using the DC-magnetron sputtering [9] 1 . The measurement was performed on the D17 polarized neutron reflectometer installed at the high-flux reactor at the Institut Laue Langevin (ILL) [10,11]. The monochromatic mode of operation with an average wavelength of 0.555 nm and wavelength spread of 4.0% in the full width at half maximum (FWHM) was used.…”

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confidence: 99%