LXV. The classification and mean lifetimes of ϑ0- and ∧0-partides

Abstract

A study is made of the properties of the decays of about 50 V ⁰-particles in a medium-sized cloud chamber equipped with either one or two lead plates but without a magnetic field. The decays are classified into those due to ϑ⁰- and to ∧⁰-particles using methods suggested by Podolanski and Armenteros (1954). The mean lives of the ϑ⁰- and ∧⁰-particles are found to be (1·2^+0·8 _-0·3) × 10^-10 sec and (4·0^+3·7 _-1·2) × 10^-10 sec respectively.