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An alpha particle with kinetic energy T = 5.3 MeV initiates a nuclear reaction Be^9 (α, n) C^12 with energy

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An alpha particle with kinetic energy T = 5.3 MeV initiates a nuclear reaction Be9 (α, n) C12 with energy yield Q = + 5.7 MeV. Find the kinetic energy of the neutron outgoing at right angles to the motion direction of the alpha-particle.

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It is understood that Be9 is initially at rest. The moment of the outgoing neutron is  The momentum of C12 is

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