# James S. Allen

## Determination of the Beta-Decay Interaction From Electron-Neutrino Angular Correlation Experiments

## Determination of the Beta-Decay Interaction from Electron-Neutrino Angular Correlation Measurements

## Electron-Neutrino Angular Correlation in the Beta Decay of Neon-19

According to Eq. (3), the experimental result X = —0.21 indicates that the beta-decay interaction contains a scalar component and that the (polar) vector component is small or zero. The interaction is therefore of the form STP. This conclusion is based on the results of the He6 experiments of Allen and Jentschke and of Rustad and Ruby, ' (2) the results of this experiment, and (3) the assumption of negligible Fierz interference.

## Electron-Neutrino Angular Correlation in the Beta-Decay of He-6

The results of this experiment seem to rule out the "no neutrino" assumption and give some indication of agreement with the 1 —(v/3c) cos8 correlation predicted by the axial vector form of interaction which follows Gamow-Teller selection rules. As mentioned above, the He6 decay is expected to be governed by this type of selection rule. It is hoped that further experiments with He' will lead to a more critical choice of the appropriate beta-interaction or combination of interactions.