Calculation of (n

2n) and (n

3n) excitation functions for 13 nonfissionable heavy nuclides of A

>

169

of which the compound-nucleus decay is without branching ratio

has been made based on the experimental values of

σ

(n

2n)

for 14 MeV fast neutron using the compound-nucleus model.The results have been compared with the experimental excitation functions. The reliability and the reasonableness of the computation are discussed.