A <i>K</i>_eff Calculation Method by Monte Carlo

Abstract

The effective multiplication factor (keff), is defined as the ratio between the number of neutrons in successive generations, which definition is adopted by most Monte Carlo codes (e.g. MCNP). Also, it can be thought of as the ratio of the generation rate of neutrons by the sum of the leakage rate and the absorption rate, which should exclude the effect of the neutron reaction such as (n, 2n)and (n, 3n). This article discusses the Monte Carlo method for keff calculation based on the second definition. And, some results are presented.