A simulational study of the indirect-geometry neutron spectrometer BIFROST at the European Spallation Source, from neutron source position to detector position.

The European Spallation Source (ESS) is intended to become the most powerful spallation neutron source in the world and the flagship of neutron science in upcoming decades. The exceptionally high neutron flux will provide unique opportunities for scientific experiments but also set high requirements for the detectors. One of the most challenging aspects is the rate capability and in particular the peak instantaneous rate capability, the number of neutrons hitting the detector per channel or cm at the peak of the neutron pulse.

Neutron reflectometry with the Multi-Blade B-based detector.

The Multi-Blade is a boron-10-based gaseous detector developed for neutron reflectometry instruments at the European Spallation Source in Sweden. The main challenges for neutron reflectometry detectors are the instantaneous counting rate and spatial resolution. The Multi-Blade has been tested on the CRISP reflectometer at the ISIS Neutron and Muon Source in the UK.

Neutron activation and prompt gamma intensity in Ar/CO-filled neutron detectors at the European Spallation Source.

Monte Carlo simulations using MCNP6.1 were performed to study the effect of neutron activation in Ar/CO neutron detector counting gas. A general MCNP model was built and validated with simple analytical calculations.

Tagging fast neutrons from a Cf fission-fragment source.

Coincidence and time-of-flight measurement techniques are employed to tag fission neutrons emitted from a Cf source sealed on one side with a very thin layer of Au. The source is positioned within a gaseous He scintillator detector. Together with α particles, both light and heavy fission fragments pass through the thin layer of Au and are detected.