# Fissile vs. Fissionable

1. Aug 12, 2014

### TauDay

1. The problem statement, all variables and given/known data

These questions refer to the terms “fissile” and “fissionable” as used in the context of current fission power reactors.

a) Describe what is meant if a nucleus is described as fissile; that is, define fissile.
Describe what is meant if a nucleus is described as fissionable; that is, define fissionable.

b) For a given nucleus, give the quantities and energy conditions that determine if the nucleus is fissile or fissionable.

2. Relevant equations

None.

3. The attempt at a solution

a) Fissile: Material that can undergo fission after capturing a thermal neutron. Fissionable: Material that can undergo fission after capturing a thermal or fast neutron.

b) Fissile: If A = Z + N is odd, given Z is even. And Z > Z(Fe)
Fissionable: If Z > Z(Fe)

2. Aug 20, 2014