UCN Upscattering rates in a molecular deuterium crystal

Details UCN Upscattering rates in a molecular deuterium crystal UCN Upscattering rates in a molecular deuterium crystal

2000-04-07

arxiv.org/abs/nucl-ex/0004003v1

Phys.Rev.B62:R3581-R3583,2000

Physics

Nuclear Physics

Nuclear Experiment

3 pages, one figure

Scientific paper

10.1103/PhysRevB.62.R3581

A calculation of ultra-cold neutron (UCN) upscattering rates in molecular deuterium solids has been carried out, taking into account intra-molecular exictations and phonons. The different moelcular species ortho-D2 (with even rotational quantum number J) and para-D2 (with odd J) exhibit significantly different UCN-phonon annihilation cross-sections. Para- to ortho-D2 conversion, furthermore, couples UCN to an energy bath of excited rotational states without mediating phonons. This anomalous upscattering mechanism restricts the UCN lifetime to 4.6 msec in a normal-D2 solid with 33% para content.

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