Theory and Detection of Highly Multiplying Fission Chains

LLNL has been making significant advances to the field of neutron multiplicity theory and experiments for several decades. Recently the statistical theory of fission chains with respect to neutron count distributions was brought into analytical form after three decades. We use this analytical form in our analysis of multiplying systems. I will discuss recent work designed to test our ability to deal with highly multiplying fissioning systems (M \textgreater 5). I will further discuss the current detector we have developed, and analysis tools used, to passively analyze these systems with both fast and thermal neutron detector arrays.