Abov, Y.G.; Krupchitsky, P.A.; Oratovsky, Y.A.; On the Existence of a Spatial Parity Non-Conserving Internucleon Potential
Yad. Phys. 1 (1965) 479;

Abstracts
The universal four-fermion weak interaction theory predicts the existence of a space-parity non-conserving nucleon-nucleon potential. All the previous attempts to detect this potential have been unsuccessful. In our experiment we measured the asymmetry coefficient in the angular distribution of -quanta, emitted by the ^{114}Cd^{*} nucleus, following the capture of polarized neutrons. The -quanta were
registered by two identical scintillation spectrometers with NaI crystalls. They picked out -quanta of the ^{114}Cd^{*} ground-state transition under the angles _{1} = 0^{°} and _{2} = 180^{°} with respect to the neutron spin. The influence of the instrumental unstability was minimized by rapid comparisons of effects induced by
polarized and unpolarized neutrons, using a rotating depolarizator. Instrumental asymmetries were excluded by performing experiments with two opposite neutron spin directions and also by measurement with interchanged spectrometers. A number of control experiments was performed and their results show, that there is no neglected instrumental asymmetry. The asymmetry coefficient proved to be equal to a = -(3.7 ± 0.9)10^{-4} and hence F approx 4 · 10^{-7}.

Accelerator
REACTOR
Detectors PHOTON

Related references More (earlier) information appears in Y. G. Abov, P. A. Krupchitsky, and Y. A. Oratovsky, Phys. Lett. 12 (1964) 25;
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Reactions

n ^{113}Cd ^{114}Cd

asym

Record comments
First evidence of the spatial-parity non-conservation in weak nuclear interactions.