Abstract
The problem of the decay of an unstable elementary particle is analysed from the point of view of a quantum-mechanical theory of randomly repeated measurements. A semi-group law of evolution, on the space of all density matrices, is shown to result. This situation is contrasted with some earlier work on the problem where a semi-group law of evolution on a Hilbert space of state vectors was postulated. Many of the difficulties of this older theory are naturally resolved within the context of the currently proposed theory.
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