Chronology of Milestone Events in Particle Physics - ABOV 1965
Chronology of Milestone Events in Particle Physics

ABOV 1965

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 114Cd* 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 114Cd* 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;
See also
R. J. Blin-Stoyle, Phys. Rev. 118 (1960) 1605;
R. J. Blin-Stoyle, Phys. Rev. 120 (1961) 181;
N. Tanner, Phys. Rev. 107 (1957) 1203;
R. E. Segel, J. V. Kane, and D. H. Wilkinson, Phil. Mag. 3 (1958) 204;
D. H. Wilkinson, Phys. Rev. 109 (1958) 1603;
D. H. Wilkinson, Phys. Rev. 109 (1958) 1610;
D. H. Wilkinson, Phys. Rev. 109 (1958) 1614;
F. Boehm and U. Hauser, Bull.Am.Phys.Soc. 4 (1959) 460;
F. Boehm and U. Hauser, Nucl. Phys. 14 (1960) 615;
D. A. Bromley et al., Phys. Rev. 114 (1959) 758;
R. Haas and L B. Leipuner, R. K. Adair, Phys. Rev. 116 (1959) 1221;
T. Mayer-Kuckuk, S. A. A. Zaidi, Z. Phys. 159 (1960) 369;
W. Kaufmann, H. Waffler, Nucl. Phys. 24 (1961) 62;
D. E. Alburger et al., Phil. Mag. 6 (1961) 171;
R. E. Segel, J. W. Olness, and E. L. Sprenkel, Phil. Mag. 6 (1961) 163;
R. E. Segel, J. W. Olness, and E. L. Sprenkel, Phys. Rev. 123 (1961) 1382;
L. Grodzins and F. Genovese, Phys. Rev. 121 (1961) 228;
P. Bassi et al., Nuovo Cim. 24 (1962) 560;
P. Bassi et al., Nuovo Cim. 28 (1963) 1049;
A. D. Gulko, Y. A. Oratovsky, and S. S. Trostin, preprint ITEP-61 (1962);
T. Vervier, Nucl. Phys. 26 (1961) 10;
A. D. Gulko, Instr. Exp. Tech. 4 (1961) 40;
R. P. Feynman and M. Gell-Mann, Phys. Rev. 109 (1958) 193;
E. C. G. Sudarshan and R. E. Marshak, Phys. Rev. 109 (1958) 1860;

Reactions
  n 113Cd 114Cd asym

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