Abstract
The Compton profile of polycrystalline NbH1.2 has been measured at room temperature using a ψ-ray Compton spectrometer with a 1.85×1010 Bq(0.5 Ci)241 Am annular source and an intrinsic Germanium detector. This is compared to the spherical average profile of NbH0.3 single crystals oriented along [100], [110] and [111]. The difference between these profiles\(J(q)_{NbH_{1.2} } - J(q)_{NbH_{0.3} }\) bears a striking similarity to the Compton profile of atomic hydrogen. This can be understood assuming that a large part of the dilute hydrogen forms atomic clusters at the grain boundaries.
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