Abstract
A neutron transport analysis is performed for liquid H 2 moderators with 100% para and normal (ortho:para=0.75:0.25) fractions. Four sets of energy-averaged cross-sections (group constants) for liquid ortho- and para-H 2 at melting and boiling points are generated and neutron energy range between 0.1 μeV and 10 eV is broken into 80 groups. Basic moderating characteristics are studied of a model cold-neutron source in a one-dimensional bare-slab geometry. It is shown that liquid para-H 2 is superior in cold neutron production to liquid normal H 2 on account of a para-to-ortho transition (molecular rotational excitation) and a good transmission property with a mean free path of about 10 cm . In the case of neutron extraction from the inside of the source, high intensity of cold neutrons is possible with liquid normal H 2 at higher temperatures up to the boiling point.
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