The electron-neutrino correlation for ${}_{}{}^6{}_{}{}^{}\mathrm{He}$ $\beta$ decay is analyzed for possible second class effects. Existing data are found to be consistent with there being no second class form factor but the conclusion is somewhat model dependent. The $e\nu$ correlation for the ${}_{}{}^{19}{}_{}{}^{}\mathrm{Ne}$ decay is considered and it is shown that an improved measurement, comparable to that achieved for ${}_{}{}^6{}_{}{}^{}\mathrm{He}$, would provide an unambiguous result concerning second class terms.

RADIOACTIVITY ${}_{}{}^6{}_{}{}^{}\mathrm{He}$; deduced second class form factor from the $e\nu$ angular correlation.

• Received 12 August 1975

DOI:https://doi.org/10.1103/PhysRevC.12.2016