An alpha particle with kinetic energy T = 5.3 MeV initiates a nuclear reaction Be 9 ( α , n) C 12 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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Sol. It is understood that 
is initially at rest. The moment of the outgoing neutron is 
. The momentum of 
is
Then by energy conservation
( 
is the mass of 
)
Thus 
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