Subject: How big is the gravitational force between nucleons?

Well, it's an odd question, but I'm not sure where else to turn for the 
numbers needed to figure it out.  Neutrons and protons, i would assume, 
exhibit gravitational attractions towards one another in the nucleus that 
must contribute to holding the nucleus together.  The masses involved are 
very small, but so are the distances (I couldn't find the exact #'s 
unfortunately).  I know that the strong force is mostly responsible for 
holding the nucleus together, but does gravity have any noticeable affect? 
 How much bigger is the strong force than the gravitational forces holding 
nucleons together?  Thanks much for any help you can render.

Re: How big is the gravitational force between nucleons?