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orthohydrogen

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orthohydrogen [¦ȯr·thə′hī·drə·jən]
(atomic physics)
Those states of hydrogen molecules in which the spins of the two nuclei are parallel.


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Low energy neutrons depolarize rapidly in orthohydrogen, while those below 15 meV retain their polarization in a parahydrogen target; hence, it is important to ensure that the liquid hydrogen target is prepared and maintained with the very low equilibrium ortho-hydrogen concentration of 0.
Measurement of parity violation in np capture: the NPDGamma experiment by Zhu, H. / Journal of Research of the National Institute of Standards and Technology
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