EFFECT OF TEMPERATURE ON THE PENETRATION OF HEAVY keV IONS IN MONOCRYSTALLINE SOLIDS: I. 133Xe IONS IN GOLD

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Abstract
The effect of target temperature on the penetration distribution of 40-kev 133Xe+ ions injected into oriented single-crystal gold has been measured from 20 to 295 °K. The penetration was determined by the anodizing–stripping procedure of Whitton and Davies (1964), and the low-temperature irradiations were performed using a special liquid helium cryostat incorporated into the Chalk River isotope separator. The observed influence of temperature is marked. The median range for both and incidence is a factor of 2 greater at 20 °K than at 295 °K, and the depths beyond which 10−2, 10−3, and 10−4 of the particles travel are, correspondingly, up to a factor of 3 greater at 20 °K. In these two directions, the range of the "perfectly" channeled particle varies with temperature consistently with the exponential dependence predicted by Lehmann and Leibfried (1963). At incidence, little channeling appears to occur characteristic of this direction, even at 20 °K; however, a few percent of the ions do have deep penetrations, arising, it is thought, from channeling skew to the . Perhaps surprisingly, the distribution exhibits a strong temperature dependence, which is suggestive of a lattice effect with higher stopping power than in amorphous material.

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