Hi, For what it's worth, I have attached a PDF file of a calculation of the Casimir binding energy of two touching protons assuming a "radius" of 0.87 fm.
Perhaps interestingly the resultant value is not a bad match for nuclear binding energy / nucleon. Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/Project.html
casimir-nucleus.pdf
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