Physics Reports vol.108

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35 MeV; our results are in close agreement with those for Fe and roughly 15% lower than those for Ag. 49E+0 (8) 1. 342) a/a p 1. 04E+1 (7) 9 . 16E+0 1. 04 (15) 1. 37E+1 (6) 9. 02 (2) 1. 12 (2) 1. 70 1. 06 (2) 1. 88E+1 (6) 1. 80 1. 38E+2 (6) 1. 99E+0 We now refer to the Coulomb and energy-loss effects. 76 for protons, and the projectile fraccional energy' loss in the ionisation attains values in excess of 10%. At incident energies to which high values of ~o correspond, the percentual energy loss of the projectile in the ionisation process is appreciable and a correlation between the two effects is to be expected.

Aside from this apparent 15 % discrepancy, one can see from the figure that there is excellent agreement between data and theory within about 10 %. (It should be noted that adjacent average points are correlated since they are largely due to the same authorsk Fig. Ib also shows, for Z2 = 22 and 28, the empirical curves of Johansson et alB and the theoretical curves of Ford et a1 9 , normalized in the same way as the experimental data. The latter are about 10 % below the CPSSR curve; this difference cannot be due to the omission of Coulomb and relativity corrections by Ford et al, since these amount only to about 1 % in this region and tend to cancel.

6) - With this value of W we find The minimum physically acceptable value of n is nmin The total cross section can be expressed as m8/M. as given, for example, by Merzbacher and Lewis (1958). the ca~culatio~ of t~e fun~tion f K, wit~ the usual approx1mate l1m1ts of 1ntegrat10n, e1ther 1n the analyt1cal approach or by numerical integration methods. , 1930, Ann. Phys. 5 325 Benka O. , 1978, Atomic Data Nuclear 22 219 Merzbacher E. , 1958, "Handbuch derPhysics" (Springer -Verlag~ Berlin) 34 166. G.

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