spin filter

spin filter

[′spin ‚fil·tər]
(electronics)
A device used in a Lamb-shift polarized ion source to cause those atoms having an undesired nuclear spin orientation to decay from their metastable state to the ground state, while those with the desired spin orientation are allowed to pass through without decay.
References in periodicals archive ?
The new Spin Filter by Diemme Enologia uses disc-shaped polymeric membranes in PVDF, mounted on stainless steel supports.
Back in 2009, Chen and his research group presented a spin filter that works at room temperature; the filter lets through electrons that have the desired spin direction and screens out the others.
In aliquots of 675 [micro]l, samples were added to a spin filter and centrifuged at 10 000 rpm for 1 min at room temperature.
Soldner, Institut Laue Langevin 5:25-5:40 [.sup.3]He spin filter for neutrons M.
The first ferromagnetic electrode in this configuration acts as a spin filter, while the second ferromagnetic layer acts an a spin detector.
A silica spin disc filter unit or a spin filter containing silica matrix suspended in 0.75 mol/L potassium acetate (pH 4.6) containing 4 mol/L guanidine hydrochloride (50 [micro]L) was placed in a 1.5-mL microcentrifuge tube, and the plasmid DNA-containing solution was applied to the spin filter units.
Third, systematic limitations of polarization measurements have been investigated: The beam polarization can now be measured with a completely different method using an opaque [.sup.3]He spin filter with an uncertainty of 0.1% [12].
Our approach to neutron polarization relies on the use of nuclear spin polarized [.sup.3]He gas cells as a neutron spin filter. [.sup.3]He has an extremely strong spin dependent capture cross section with essentially all capture in one spin state.
* A New Approach to Accurate Polarimetry of Polychrometic Cold Neutron Beams with a [.sup.3]He Spin Filter
The 0.496 nm neutron beam is used for neutron radiometry experiments, [.sup.3]He spin filter development, and neutron dosimetry work.
A new beam-line at the Los Alamos Neutron Science Center (LANSCE) delivers pulsed cold neutrons to the apparatus, where they are polarized by transmission through a large volume polarized [.sup.3]He spin filter and captured in a liquid para-hydrogen target.
Due to the 1 mT holding field surrounding the experimental apparatus, the neutrons are polarized vertically after leaving the [.sup.3]He spin filter. While taking hydrogen data, the parity violating asymmetry in n-p capture is therefore seen in a difference of the number of [gamma] rays going up and down.