Tap 535- 1: Applying conservation of baryon and lepton number

Assume that electric charge, baryon number and lepton number are all conserved in each reaction, and that the mass of the reactants cannot be less than the mass of the products.

1. 
   n  p + e^- + ……
   

2. 
   …… + n  …… + e^-
   

3. 
   ⁺  ⁺ + ……
   

4. 
   p  n + _e + e⁺
   

1. 
   n  p + e^- + _e-bar
   

2. 
   _e + n  p + e^-
   

e- + n  n + e^- is also a correct answer!

3. 
   ⁺  ⁺ + _
   

4. 
   p  n + _e + e⁺