Single-particle assumption 2s1/2
Magnetic moment should be that of the proton + 2.79 nuclear magnetons.
It is instead +1.93 nuclear magnetons.
gives
*GT matrix element || = sqrt(3) (it is really more like 0.3)
*for s1/2 Weak magnetism has no contribution from orbital angular momentum, so is either 4.7 (Hayes) or 3.8 (Calaprice) i.e. either the isovector magnetic moment or the anomalous isovector magnetic moment.
The weak magentism for 37K is dominated by the 37Ar neutron-like magnetic moment, so 47K should be about 4x larger correction to Abeta since energy is similar.
(0.005 * 4 = 0.02?)
*For s1/2 the sigma cross l operator for 1st-class induced tensor d should
also be zero?