ENERGY-LOSS AND STOPPING POWER OF HE-4 IONS IN MYLAR FOILS

The energy loss and stopping power of He-4 ions in mylar foils were de termined in a transmission geometry. The experimental stopping power d ata were compared to the previous measurements at higher energies. At lower energies, no previous measurements exist. The present results we re also compared to the commonly used semiempirically theoretical pred ictions by Ziegler and Manoyan, and significant deviations were observ ed.