The Coulomb barrier keeping two nuclei apart is given by V(r) = Z₁Z₂e²/(4??₀r), where r is the relative separation of the two nuclei. Assume that V reaches its maximum value V_C when r ? R₁ + R₂, where R_j is the radius of the jth nucleus. Using eq. (17.10)

estimate the Coulomb barrier between a carbon nucleus and an? particle. Compare your results with Figure 18.9

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R(A) ROA/3