First slide
Nuclear stability

The fission of U  235 can be triggered by the absorption of a slow neutrons by a nucleus. Similarly, a slow proton cannot also be used. This statement is 


Because the neutron has no electric charge, it experiences no electric repulsion from a U235 nucleus. Hence a slow-moving neutron can approach and enter a U235 nucleus, thereby providing the excitation needed to trigger fission. By contrast a slow-moving proton feels a strong repulsion from a U235 nucleus. It never gets close to the nucleus, so it cannot trigger fission

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