Question

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.

Answer 1

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