Abstract
The decay processes are investigated based on Nishijima and Gell-Mann's charge independence theory of heavy unstable particles. We assume that the decay interaction Hamiltonian is a spinor in isotopic spin space, when all particles participating in a decay process have definite isotopic spins. The branching ratio of various decay modes including radiative decays and the relation of lifetimes among charge multiplets are obtained. For instance, the difference between lifetimes of θ0 and of θ+, and the branching ratio of the т+ particle are well interpreted under our assumption. Our theory is also applied to the decay of the lightest hyperfragment 3Hʌ.
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