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The isotopic spin impurity introduced into nuclear states by the Coulomb interaction is calculated with jj-coupling shell-model wave functions. Upper limits on the impurity present in $N=Z$ nuclei for 4≤A≤16 are given and shown to be in agreement with the experimental work of Wilkinson on the isotopic spin selection rule for $E1$ transitions.
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William M. MacDonald (1956) studied this question.
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