Stopping powers of Al,Ti, Cu,Zr, Rh,Ag, Ta and Au for 26 MeV alpha particles and Z3 1 correction

Abstract

Stopping powers of Al, Ti, Cu, Zr, Rh, Ag, Ta and Au for 26 MeV alpha particles have been measured using a surface barrier silicon detector with an accuracy of 0.35%. The stopping powers for alpha particles divided by 4 have been compared with the stopping powers for 6.500 MeV protons of the same velocity. Experimental magnitudes of the Z ³ ₁ correction which is contained in the Bethe-Bloch stopping formula were extracted using the alpha-proton difference. Using the experimental Z ³ ₁ corrections thus obtained and the experimental Z ³ ₁ corrections of the previous paper, parameters of γ and b which appear in the theory of Ashley, Ritchie and Brandt for the Z ³ ₁ correction have been determined with exactly the same method as the previous paper as γ = 1.336 and b = 1.32. The magnitude of the Z ³ ₁ correction calculated by the theory of Ashley, Ritchie and Brandt using these parameters have been compared with those obtained by other authors.