Partial conservation of axial-vector current and nuclear beta decay

Abstract

The disagreement pointed out by Armstrong and Kim between the elementary particle approach and the impulse-approximation predictions for $\ensuremath{\Delta}{J}^{P}={0}^{\ensuremath{-}}$ nuclear $\ensuremath{\beta}$ decay is examined from the point of view of the axial current operator. Naive theoretical predictions are found to be in disagreement with present data.[RADIOACTIVITY Discuss PCAC in $\ensuremath{\beta}$ decay; calculated spectra for ${0}^{+}$-${0}^{\ensuremath{-}}$ transition.]