The effective multiplication factor k_eff = (neutrons produced in gen n+1) / (neutrons produced in gen n). k<1: subcritical (decaying); k=1: critical (steady operation); k>1: supercritical (exponential growth, divergence).
The effective multiplication factor k_eff = (neutrons produced in gen n+1) / (neutrons produced in gen n). k<1: subcritical (decaying); k=1: critical (steady operation); k>1: supercritical (exponential growth, divergence).