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Pion attenuation following nucleon decay within a nucleus is examined. It is found that predictions of pion survival may be made by use of established phenomenology. The reduction in pion flux is a factor of 2 for ¹²C or ¹⁶O. This implies that the number of observable μ⁺'s for a water source would be 0.55 times that from a free-nucleon mixture. For the π⁰-e⁺ mode the probability of survival as a correlated pair is 0.33.
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D. A. Sparrow (1980) studied this question.
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