A 15 MeV a particle (mass 3730 MeV/c^2) is approaching a heavy nucleus head on. Approximate the Coulomb repulsion between the a and the nucleus by the square barrier of height 20 MeV and width 10 fm. What is the probability the a particle tunnels into the nucleus?
A. 7e-12
B. .016
C. 9e-9
D. 16e-4
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