Observation of KNO scaling in the neutral energy spectra from αα and pp collisions at ISR energies

Neutral transverse energy spectra in pp and αα interactions are analyzed in terms of the Wounded Nucleon Model. Analysis of the αα spectrum by application of a multiple nucleon-nucleon collision mechanism is conveniently performed when a Gamma Distribution is used to represent the pp spectral shape. The Wounded Nucleon Model provides a reasonable description of the αα spectrum for the first 3 orders of magnitude, but completely fails to account for the slope of the high energy tail of the distribution. However, the pp and αα spectra can both be fit to the same Gamma Distribution when scaled by their respective mean values and thus exhibit KNO scaling