Kaonic-atom x-ray intensities of elements $Z=3, 6, 8, 11, \mathrm{and} 20$ were significantly reduced when the elements were in hydride form. The ratios $\frac{I\left(Z{\mathrm{H}}_m\right)}{I\left(Z\right)\mathrm{}}$ have a noticeable $Z$ dependence. Deuterides of C and O showed slightly less x-ray emission than their hydride counterparts.

• Received 22 November 1976

DOI:https://doi.org/10.1103/PhysRevA.15.1780