Question on Nuclear Current

I've been reading about anapole moments, which are caused by nuclear currents. Nuclear currents come from the exchange of bosons, charged or uncharged. Feynman diagrams of the interaction show that a neutron decays into a proton, electron, and electron anti-neutrino, via a W- boson.

My question is how do you have any type of sustained nuclear current if the current comes from a decay process? If all of the neutrons are decaying into protons and electrons, then it seems like the atomic number is changing.

The anapole moment has been measured for Cesium, so I assume an atom isn't changing into something else to have an anapole moment.

Thanks for any info!