However, if the mass is critical only when the delayed neutrons are included, then the reaction can be controlled, for example by the introduction or removal of neutron absorbers.
Kud ijja awen, a fal takunkut samaxatar alwaq wa id neutron tan wi aqqim nen ahan dihen alwazab addobat ad at awakkal , almital s ijjuch meɣ azajor n neutron absorbers