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## Homework Statement

How to calculate the Coulomb barrier between a proton and a lithium nucleus. The variable is r (interaction radius). The known data is Z

_{1}, Z

_{2}, k (Coulomb constant), and e (elementary charge).

## Homework Equations

The equation is U

_{Coul}= kZ

_{1}Z

_{2}e

^{2}/r

## The Attempt at a Solution

I used the sum of lithium's atomic radius and the radius of a proton as the interaction radius. I got 1.5200084x10

^{-10}m. I plugged in all the numbers and got 4.552437x10

^{-18}as my Coulomb barrier, which I think is incorrect.