Is there any simple explanation as to why two neutrons won’t bond together in an atomic “nucleus” (I’m not sure that would be the word). Certainly a proton and a neutron will and I thought the strong (color) force was independent of nucleon type.
Wikipedia says if the strong force were 2% stronger, then Helium-2 would be stable. I assume that means if it were just a bit stronger, it would overcome the electrostatic repulsion, but what is it that is pushing two neutrons apart and keeping them from bonding?
(And yes I’m aware of neutron stars. I’m thinking of just two neutrons in otherwise empty space.)