We have measured branching ratios for the isospin-nonconserving particle decays of the 15.1-MeV T=3/2 states in ¹³N and ¹³C to the (0.0, 0⁺) and (4.44, 2⁺) states of ¹²C. By comparing ratios of reduced widths with the 0⁺ and 2⁺ states of ¹²C for the mirror decays, we show that the form of the isospin impurity in the 15.1-MeV states depends on Tz.
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Adelberger et al. (1969) studied this question.