Search for second-class current: the measurement of the beta - gamma directional correlation in the decay of /sup 20/Na
(1977) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics —
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- The beta (/b E//sub 0/=11.76 MeV)- gamma (1.63 MeV) directional correlation has been measured as a function of the beta -energy in the decay of /sup 20/Na. Denoting the correlation function by /b W//sub +/( thetas )=1+ alpha /sub +/(/b E/) cos/sup 2 / thetas , the result can be expressed phenomenologically as alpha /sub +/(/b E/)=[(-4.0 +/-0.7*/sup -3//b E /+(1.3+/-0.9)*10/sup -4//b E//sup 2/] (/b p ///b E/)/sup 2/, where /b E/ is the positron total energy in MeV and /b p/ its momentum in MeV/c. Assuming the correctness of nuclear structure calculations and the validity of the conserved vector current theory, it indicates the presence of a second-class current in the nuclear weak interaction.
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Rolin, N., Deutsch, J. P., Favart, D., Lebrun, M., & Prieels, R. (1977). Search for second-class current: the measurement of the beta - gamma directional correlation in the decay of /sup 20/Na. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. https://hdl.handle.net/2078.5/85060