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To activate the reaction`(n,alpha)` with stationary `B^(11)` nuclei, neutrons must have the threshold kinetic energy `T_(th)=4.0MeV`. Find the energy

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To activate the reaction`(n,alpha)` with stationary `B^(11)` nuclei, neutrons must have the threshold kinetic energy `T_(th)=4.0MeV`. Find the energy of this reaction.
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We have `4.0=(1+(m_(n))/(M_(B^(11))))|Q|`
or `Q=(11)/(12)xx4MeV= -3.67MeV`
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