Abstract
From the “new” experiments performed in the A = 12 mass multiplet, viz. i) beta-decay asymmetry of aligned 12B/12N mirror nuclei and ii) the average and longitudinal polarizations of 12B (g.s.) produced by μ-capture in 12C, we learned about the nature of weak interactions:
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there are no second class axial-vector currents,
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the weak magnetism is now verified in μ-capture,
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-the helicity of the “muonic” neutrino is measured with good precision (≃ 10%) (the result agrees with the standard V-A scheme).
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References
T.N.K. Godfrey, Thesis, Princeton University, 1954 (unpublished)
K. Koshigiri, Osaka preprint (1979, to be published in Nucl. Phys.)
C.S. Wu, Y.K. Lee and L.W. Mo, Phys. Rev. Letters 39 (1977) 72
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Since Pav is a scalar, this is merely a convenient choice
More recent calculations [M. Kobayashi et al., Nucl. Phys. A312 (1978) 377 and W.-Y. Hwang (preprint 1979)] yield Pav(1-) > 0. This affects the value of WM (μ)only very slightly, the value of (gp+gT)/gA becomes 10 ± 2.7 which is still compatible with the PCAC prediction
P. Truttmann et al., Phys. Lett. 83B (1979) 48
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Grenacs, L. (1980). Polarization Experiments in the Godfrey-Cycle. In: Crowe, K., Duclos, J., Fiorentini, G., Torelli, G. (eds) Exotic Atoms ’79 Fundamental Interactions and Structure of Matter. Ettore Majorana International Science Series, vol 4. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-3042-4_5
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