Symbolization of nuclear reaction

Symbolization of nuclear reaction:

7N14 + 2He4 →    8O17 +   1H1
          projectile         ejected particle

This reaction can be symbolized as (α, p) type reaction. Therefore the above reaction is symbolized as,

7N14(α,p) 8O17


Q value of a nuclear reaction:

The quantity of energy absorbed or liberated during nuclear reaction is termed as Q-value of nuclear reaction.

Qvalue = (mp-mr) 931 MeV

Here,
mr = Sum of the masses of reactants
mp = Sum of the masses of products

When energy is absorbed then mp > mr, then Q value will be positive.

Q value of a nuclear reaction in the condition of energy liberated = (mp – mr) 931 MeV. In the case of energy liberated, mr > mp, and therefore Q value will be negative.

 

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