On the Disintegration Products of the 2.2-μSec. Meson

An investigation of the penetration through absorbers of various elements by the charged particles that result from the 2.2-μsec. meson decay is reported. Mesons and decay particles are detected by an arrangement of Geiger-Müller counter trays, and delayed coincidence techniques are used to select the desired events. The absorption measurements exhibit two components in the decay radiation, one of which is much more penetrating than the other. In lead, for example, the "soft component" is essentially absorbed by about 20 g/${\mathrm{cm}}^2$, while the "hard component" is easily detected after 38 g/${\mathrm{cm}}^2$.