Abstract
Measurements of the transverse nuclear spin relaxation times T2 of HD impurities in solid hydrogen have been carried out at low temperatures to test for quantum tunneling of the impurities in a para-H2 matrix. The motion of the HD impurities is believed to be similar in nature to the exchange of atoms in dense hcp 3He. We compare the observed density and temperature dependence of T2 with that predicted by the quantum tunneling model.
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