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GOLDHABER 1958C

Goldhaber, M.; Grodzins, L.; Sunyar, A.W.;
Helicity of Neutrinos
Phys. Rev. 109 (1958) 1015;

Reprinted in
R. N. Cahn and G. Goldhaber, The Experimental Foundations of Particle Physics, Cambridge Univ. Press (1991) 180.
The Physical Review - the First Hundred Years, AIP Press (1995) CD-ROM.

Summary
Combined analysis of circular polarization and resonant scattering of γ rays following orbital electron capture measures the helicity of the neutrino. We have carried out such a measurement with ^152mEu, which decays by orbital electron capture. If we assume the most plausible spin-parity assignment for this isomer compatible with its decay scheme, 0^–, we find that the neutrino is "left-handed,'' i.e., σ_ν · hat p_ν = -1 (negative helicity). (Extracted from the introductory part of the paper.).

Accelerator SOURCE Detectors CNTR

Related references
More (earlier) information appears in
M. Goldhaber, L. Grodzins, and A. W. Sunyar, Phys. Rev. 106 (1957) 826;
M. Goldhaber, L. Grodzins, and A. W. Sunyar, Phys. Rev. 109 (1958) 1015;
See also
R. P. Feynman and M. Gell-Mann, Phys. Rev. 109 (1958) 193;
T. D. Lee and C. N. Yang, Phys. Rev. 105 (1957) 1671;
E. C. G. Sudarshan and R. E. Marshak, Phys. Rev. 109 (1958) 1860;
Analyse data from
M. T. Burgy, Epstein, Krohn et al., Phys. Rev. 107 (1957) 1731;
G. Culligan et al., Nature 180 (1957) 751;
B. M. Rustad and S. L. Ruby, Phys. Rev. 97 (1955) 991;
H. Postma et al., Physica 23 (1957) 259;
E. Ambler et al., Phys. Rev. 106 (1957) 1361;
L. A. Page and M. Heinberg, Phys. Rev. 106 (1957) 1220;
W. B. Herrmansfeldt, D. R. Maxson, P. Stahelin, and J. S. Allen, Phys. Rev. 107 (1957) 641;

Reactions

	e– 152Eu 152Sm* νe
	152Sm* 152Sm γ		pol

Particles studied

ν

qn

Record comments
First evidence for the negative ν_e helicity (ν_e is left handed).

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