Abstract
We present a calculation of the circular polarization P γ and asymmetry A γ of gamma radiation in thermal neutron-proton capture with a tested numerical accuracy of 1%. The effect of neutral currents is discussed on the example of the Weinberg-Salam model of weak interaction. It is also shown that a one percent contribution of the 3S 1 scattering state to the regular np capture cross section destroys the favourable isospin selection rule in the polarization.
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