Get access

Further observations of projectile-z dependence in target parameters of modified Bethe–Bloch theory



Several studies of a systematic dependence on projectile atomic number (z) of the values of the two prominent target parameters of modified Bethe–Bloch theory have been published over the past 3 years. The target materials for which parameter values were extracted from stopping power measurements by analyses with modified Bethe–Bloch theory were initially the four organic (co)polymers—formvar, polyimide, polysulfone, and vyns—and the cobalt-base alloy, havar. An additional (in press) study for the frequently utilized target materials, aluminum and copper, and for titanium and zinc targets, revealed considerable corroboration of the initially discovered trends. The scope of the investigation has been enlarged in the current study to include analyses of measurements with light projectiles of the stopping powers of 11 halogenated hydrocarbons, and with both light projectiles and heavy ions of the stopping powers of kapton (a polyimide), polycarbonate, havar, and nickel. The results of this, most recent, study are also generally corroborative of the previously established pattern of behavior of the two prominent parameters of modified Bethe–Bloch theory. © 2003 Wiley Periodicals, Inc. Int J Quantum Chem, 2003