The nonrelativistic impulse approximation for the induced-tensor interaction has been analyzed in detail. $\mathrm{ft}$ values for mirror transitions have been calculated using electron Coulomb wave functions for the extended charge distribution and introducing higher-order corrections. 14 angular $\beta -\gamma$ correlations, the $\beta$ transition being allowed, have been analyzed, showing that this process is sensitive to the presence of the induced-tensor interaction. The amount of information about the induced tensor at present obtainable from circular $\gamma$ polarization in nuclear transitions has been investigated. A limit on the induced-tensor coupling constant has been obtained which does not contradict the evidence based on $\mathrm{ft}$ values. $\beta -\gamma$ angular correlations seem to yield evidence for the weak-magnetism term, while not excluding the existence of the induced tensor.

• Received 22 February 1972

DOI:https://doi.org/10.1103/PhysRevC.6.1