Evidence of Anomalous Behavior of Relativistic Alpha Particles Emitted inC12-Emulsion Interaction at 4.5 GeV/cper Nucleon

This paper presents evidence of the anomalous interaction mean free path of the relativistic alpha particles emitted from the interaction of ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ with emulsion nuclei at 4.5 GeV/c per nucleon. The tracks were followed systematically through the stack. The detailed measurements show clearly that the interaction mean free path is anomalously shorter for fewer centimeters after their emission. The results have been compared with other results obtained from both accelerator and cosmic-ray data.