Experimental investigations of proposed transition effect in particle ionisation loss

Measurements of the ionisation loss of relativistic particles in traversing thin layers of gas have revealed a discrepancy between observation and theoretical prediction. Garibian has proposed a theoretical transition mechanism to account for this situation. The present experiment, with 2.4 GeV positrons and thin layers of argon, attempted to measure this transition effect. No significant effect was found under the particular conditions of the experiment. (Auth.)