Berlin 2015 – scientific programme

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AGA: Arbeitsgruppe Physik und Abrüstung

AGA 13: Warhead Dismantlement and Verification Technologies

AGA 13.2: Talk

Thursday, March 19, 2015, 17:30–18:00, EMH 225

Geant4 for Neutron Multiplicity Measurements Simulations — •Moritz Kütt — IANUS, Technische Universität Darmstadt

Neutron multiplicity measurements allow to estimate the mass of plutonium in a detector cavity for different applications. One future application is the verification of nuclear disarmament. Computer simulations are used to improve and test detector designs, to study a large range of use cases and, especially relevant for disarmament verification, possible ways to hamper or cheat specific systems.

Based on the Monte Carlo particle transport framework Geant4, an application to simulate multiplicity measurements of plutonium samples as an Open Source alternative to established codes has been developed. Although the main purpose of Geant4 has been detector simulations for high energy physics, it includes cross-sections and simulation capabilities for low-energy neutron reactions. A special source definition, a routine to estimate the rate of neutrons produced by (α , n) reactions and a special library to derive the plutonium mass from the pulse train of neutron detection events have been added. The code has been validated using data from a neutron multiplicity benchmark exercise.