Estimate the depth of the proton-neutron potential approximated by the spherical square well. It is known from experiment that the binding energy is close to zero (deuteron), nucleon mass m "" 940 MeV, and the radius of the potential R"" 2 fm.
(b) Compare your answer for (1) with the Coulomb interaction of two protons at a distance of 2 fm.
Hints: using units h = c = 1,
1 fm^-1"" 197 MeV
e^2/hc "" 1/137
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