+1 vote
in Physics by kratos

The irradiation of lithium and beryllium targets by a monoergic stream of protons reveals that the reaction Li7(p, n) Be7 - 1.65 MeV is initiated whereas the reaction Be9(p, n)B9 — 1.85 MeV does not take place. Find the possible values of kinetic energy of the protons.

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+5 votes
by kratos
 
Best answer

Since the reaction Li7(p, n) Be7 (Q = - 1.65 MeV) is initiated, the incident proton energy must be

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