Does the lifetime of an unstable system depend on the measuring apparatus?

  title={Does the lifetime of an unstable system depend on the measuring apparatus?},
  author={Antonio Degasperis and Luciano Fonda and Giancarlo Ghirardi},
  journal={Il Nuovo Cimento A (1965-1970)},
SummaryWithin the description of the experimental determination of the decay law recently proposed we investigate the possibility that the experimentally determined lifetime τ be different from the theoretical lifetime 1/γ for undisturbed evolution of the unstable quantum system. It is shown that in some specific examples the deviation of τ from 1/γ is competitive with the accuracy of the experiment. It is made plausible that such a difference, together with a variation of τ with the different… 
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