Q-Value | KE of Alpha Decay (Kinematics)

Alpha Decay process leads to the emission of a Helium nuclei which carries off majority of the Disintegration energy (or Q value of reaction) of the nuclear reaction.
The Q-value of the reaction is the energy associated with the mass defect of the reaction. This is the amount of energy released in the nuclear disintegration. We can calculate the Kinetic Energy of the alpha particle from this Q-value by looking into the Kinematics of the reaction.
By using the conservation of linear momentum, and the conservation of energy, we can derive that KE=(A-4)Q/A where A is the mass number of the parent nuclei.

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