Write the rate laws for the following elementary reactions. (Rate expressions take the general form: rate = k . [A]a . [B]b.)?

Write the rate laws for the following elementary reactions. (Rate expressions take the general form: rate = k . [A]a . [B]b.)
20     20
   F → Ne + β (nuclear decay)
9      10

-Hello, I know the general form of how to do this is basically xA + yB → products so rate = k [A]^x [B]^y

How would I find the rate law if it is set up like this and what does it mean by nuclear decay? Thank you