Monte Carlo simulation of the n-TOF Total Absorption Calorimeter

C. Guerrero, D. Cano-Ott, E. Mendoza, J. L. Taín, A. Algora, E. Berthoumieux, N. Colonna, C. Domingo-Pardo, E. González-Romero, M. Heil, D. Jordán, F. Käppeler, C. Lampoudis, T. Martínez, C. Massimi, R. Plag

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Abstract

The n-TOF Total Absorption Calorimeter (TAC) is a 4π BaF 2 segmented detector used at CERN for measuring neutron capture cross-sections of importance for the design of advanced nuclear reactors. This work presents the simulation code that has been developed in GEANT4 for the accurate determination of the detection efficiency of the TAC for neutron capture events. The code allows to calculate the efficiency of the TAC for every neutron capture state, as a function of energy, crystal multiplicity, and counting rate. The code includes all instrumental effects such as the single crystal detection threshold and energy resolution, finite size of the coincidence time window, and signal pile-up. The results from the simulation have been validated with experimental data for a large set of electromagnetic de-excitation patterns: β-decay of well known calibration sources, neutron capture reactions in light nuclei with well known level schemes like natTi, reference samples used in (n,γ) measurements like 197Au and experimental data from an actinide sample like 240Pu. The systematic uncertainty in the determination of the detection efficiency has been estimated for all the cases. As a representative example, the accuracy reached for the case of 197Au(n,γ) ranges between 0.5% and 2%, depending on the experimental and analysis conditions. Such a value matches the high accuracy required for the nuclear cross-section data needed in advanced reactor design.

Original languageEnglish
Pages (from-to)108-117
Number of pages10
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume671
DOIs
Publication statusPublished - Apr 11 2012

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Keywords

  • Geant4
  • Monte Carlo simulation
  • Neutron capture
  • Neutron cross-sections
  • Time-of-flight

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

Guerrero, C., Cano-Ott, D., Mendoza, E., Taín, J. L., Algora, A., Berthoumieux, E., Colonna, N., Domingo-Pardo, C., González-Romero, E., Heil, M., Jordán, D., Käppeler, F., Lampoudis, C., Martínez, T., Massimi, C., & Plag, R. (2012). Monte Carlo simulation of the n-TOF Total Absorption Calorimeter. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 671, 108-117. https://doi.org/10.1016/j.nima.2011.12.046