The radionuclide 11C decays according to
116C → 115B + e+ + v
Show that the disintegration energy is given by
Q = (mC - mB - 2me) c2
Q = (mi - mf) c2
The Attempt at a Solution
Q= (mC - mB - me) c2
Im probably missing something obvious but I can't see where the 2me comes from.