parity violation

Seventh Annual Rochester Conference

Apr 15 1957
Comment(s): 

Feynman informally suggests early version of VA theory
International Conference on High Energy Physics

Theory of the classical Beta-Decay Measurements

E. J. Konopinski
Proceedings of the Rehovot Conference on Nuclear Structure
Sep 10 1957
Excerpt(s): 

Recent developments have forced the generalization of the beta interaction to the inclusion of odd with even couplings. Two further kinds of generalizations must also be considered until definite experimental decision are available: the possibility that time-reversal invariance does not hold (that the coupling constants are complex) and the possibility that “lepton conservation” fails (both neutrinos and anti-neutrinos are emitted in a given process).


Introduction. The category of “classical “ measurements on nuclear beta-decay is introduced here as a distinction convenient for this conference. Newer experiments, which have exhibited the failure of parity conservation (as formerly understood), are to receive separate and fuller discussion by the authors of that development themselves. Here we shall be primarily concerned with interpretations of data from longer established lines of experimentation, hence “classical” ones.

7. Conclusions from Electron-Recoil Correlations. The electron-neutrino correlation measurements are relied upon to distinguish between the scalar and vector forms of the Fermi coupling, and between the tensor and axial vector forms of GT coupling.

The earliest definitive measurement, by Rustad and Ruby, yielded aGT > 0.16 and

Before the A35 measurement was announced, it was consider most probable that all the GT radiation is generated by tensor coupling, all the Fermi radiation by scalar coupling. This corresponds to the straight line labelled S,T in Fig 2. However that conclusion was upset by the A35 result, which demands that the scalar coupling constitute no more than the fraction e of the Fermi radiation! In view of the near isotropy of the neutron and Ne19 recoils, the He6 and A35 results appear to be irreconcilable

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Favoring the conclusions from Ne23 (vs. He6) is the fact that it brings into consistency all the results except that on He6. One the other hand, the He6 experiment should be the most nearly ideal one. For the present, one must keep in mind two possible resolutions of the situation: [2 equations]. It seems to early to choose between these.

Question of Parity Conservation in Weak Interactions

T. D. Lee and C. N. Yang
Physical Review
Jun 22 1956
Comment(s): 

Nobel-winning paper
On first glance it seems unrelated to recoil experiments

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