Velocity Dependence of the Stopping Power of Channeled Iodine Ions
Recent measurements of some uranium ion stopping powers, in the energy range 30–90 MeV , in polycrystalline targets, together with earlier data for Br ions and I ions have shown that, in the energy region where the theories of Lindhard, Scharff and Shiøtt  and Firsov  predict that electronic stopping should obey the relation Se = k1/2, the data show that Se = a + bE1/2. Fig. 1 is illustrative of the fact that heavier ions show a larger value of a than that for light ions. Presumably this effect would be unimportant for ions as light as oxygen. In particular, stopping power data for uranium ions has been compared with the theoretical predictions of the theories of Lindhard and Firsov for carbon, nickel and gold respectively, as shown in Figs. 2–4. The important point is that the data cannot be reconciled with theory by a simple change of slope.
KeywordsPlanar Channel Velocity Dependence Union Carbide Corporation Thick Foil Stopping Power
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