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Based on what I know (it might be wrong) properties of nuclei are calculated based on the different (simplified) models of the p and n "particles" (shells, droplets etc). I have 2 questions:

1. To what extent can we assume that n and p are "elementary" particles bound by residual strong force versus true picture on 3*(n+p) valence quarks and pure QCD? If we could calculate using both models - quark and hardon, what would be the level of inaccuracy of the simplified hardon model?

2. I've also heard that the computational complexity in QCD increases exponentially with the number of particles (when matter is cold enough). How far are is the current computational power (I don't mean a single computer, but huge networks like SETI@home, or power of video cards wasted on "mining bitcoins"). So how far is that power from being useful to calculate nuclear properties using "pure" QCD? May be not Uranium, but lighter elements?

Thank you