Low-Energy Nuclear Physics Test for a Possible Isotensor Component of the Electromagnetic Interaction

It is shown how a comparison of the $\gamma$ widths for corresponding $T=\frac{3}{2}\to T=\frac{1}{2}$ transitions in mirror nuclei can give information about a possible isotensor component of the electromagnetic interaction. From data available at present it is concluded that the isotensor $\gamma$ transition amplitude in the decays considered is less than about 10% of the isovector amplitude.