OPM (Ortho-para monitor)

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The neutron polarization is well known before the interaction with the target. Within the target neutron will interact with the two hydrogen molecular states (orthohydrogen and parahydogen), The interaction with ortho state can lead to neutron spin-flip scattering, in order to minimize neutron depolarization (<2%), the concentration of parahydrogen in target must be 99.98% or higher and determined to a precision of at least 0.05%.


Interactions cold neutrons in hydrogen

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Cold neutrons can be scattering Molecular hydrogen has two possible states, one with the two hydrogen nuclei aligned parallel (orthohydrogen) and the other with two hydrogen nuclei aligned antiparallel (parahydrogen).

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