title: Simulation of neutron production using MCNPX+MCUNED.
abstract: In standard MCNPX, the production of neutrons by ions cannot be modelled efficiently. The MCUNED patch applied to MCNPX 2.7.0 allows to model the production of neutrons by light ions down to energies of a few kiloelectron volts. This is crucial for the simulation of neutron reference fields. The influence of target properties, such as the diffusion of reactive isotopes into the target backing or the effect of energy and angular straggling, can be studied efficiently. In this work, MCNPX/MCUNED calculations are compared with results obtained with the TARGET code for simulating neutron production. Furthermore, MCUNED incorporates more effective variance reduction techniques and a coincidence counting tally. This allows the simulation of a TCAP experiment being developed at PTB. In this experiment, 14.7-MeV neutrons will be produced by the reaction T(d,n)(4)He. The neutron fluence is determined by counting alpha particles, independently of the reaction cross section.
authors.affiliation: Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, Braunschweig 38116, Germany martin.erhard@ptb.de.
authors.forename: M
authors.initials: M
authors.lastname: Erhard
authors.affiliation: Departamento de Ingeniería Energética, E.T.S. Ingenieros Industriales, Universidad Nacional de Educación a Distancia (UNED), C/Juan del Rosal 12, Madrid 28040, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Sauvan
authors.affiliation: Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, Braunschweig 38116, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Nolte
mesh_terms: D000512:Alpha Particles; D003198:Computer Simulation; D003903:Deuterium / Q000737:chemistry; D004867:Equipment Design; D005858:Germany; D007477:Ions; D008094:Lithium / Q000737:chemistry; D009010:Monte Carlo Method; D009502:Neutrons; D010315:Particle Accelerators; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods*; D014316:Tritium / Q000737:chemistry
chemical_list: D007477:Ions; D014316:Tritium; D008094:Lithium; D003903:Deuterium