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Let the nuclear interaction strengths between two protons, two neutrons, and a proton-neutron pair be represented by F_pp, F_nn, and F_pn respectively. Which relation is correct?

1. F_pp = F_nn = F_pn
2. F_pp ≠ F_nn = F_pn
3. F_pp = F_nn ≠ F_pn
4. F_pp ≠ F_nn ≠ F_pn

Correct answer: F_pp = F_nn = F_pn

Solution

The strong nuclear force is charge independent, so the interaction strength is the same for any nucleon pair: F_pp = F_nn = F_pn.

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