ISOTOPE EFFECT IN HEAVY ION RANGE STUDIES

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Abstract
From measurements of the isotope ratio (Na22/Na24) at various depths of penetration, it has been possible to determine at 24 kev the small difference in the median ranges of the sodium isotopes. Na22 has the slightly larger median range, as is predicted by the Nielsen equation. Monte Carlo calculations show that an isotropic elastic-scattering model provides a reasonable explanation for the magnitude of the range difference and for the observed variation in the isotope ratio as a function of depth.