Simulations of Neutron Multiplicity Counters with MCNP-PTA

The paper is about the improvements and new features related to simulation of neutron multiplicity counters with the MCNP-PTA (Pulse Train Analysis) code developed at JRC Ispra. Simulation models of multiplicity counting electronics, like the JSR-14, AMSR-150, and MI-PTA have been added, paying extra attention to model faithfully all of their characteristics (de-randomising input buffer, pulse pair resolution, clock frequency and direction in time of the gates). Moreover simulation models of several de-randomising mixer circuits have also been added to the PTA program. This is especially important for the correct simulation of measurements with large Pu samples, which involve very high-count rates. In the case of multiplicity counting accurate modelling is mandatory, as will be shown for an Active Well Coincidence Counter. Attention will also be given to the importance and limitations of the nuclear data used in the simulation.

LOOMAN Marc;  PEERANI Paolo;  MARIN FERRER Montserrat; 

2007-10-16

OPOCE

JRC37888