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Manuscript Title: A time-of-flight spectrum simulator for neutron elastic and inelastic scattering.
Authors: G.H.R. Kegel
Catalogue identifier: ABKJ_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 24(1981)205
Programming language: RTE Assembler.
Computer: HP1000.
Operating system: RTE-II.
RAM: 12K words
Word size: 16
Peripherals: disc.
Keywords: Nuclear physics, Cross section, Scattering, Disc scatterer, Numerical integration, Neutron, Simulation, Apparatus design, Time-of-flight spectrum.
Classification: 17.1.

Nature of problem:
Program IMBUI was written to assist in the design and the data analysis of high resolution neutron time-of-flight experiments using a subnanosecond, pulsed Van-de-Graaff accelerator. Several factors govern the resolution in these experiments; there are timing uncertainties, variations in neutron velocities, and uncertainties in flight path lengths. Through careful selection of experiment parameters it is possible to optimize resolution without sacrificing the detector counting rate. IMBUI assists in this task by providing the user with simulated time spectra, which include geometric and kinematic effects.

Solution method:
Time-of-flight spectra may be obtained as integral transforms involving integration over the scatterer volume. IMBUI evaluates these scatterer integrals using appropriate numerical techniques.

The following effects are not taken into account:
1. Neutron multiple scattering. These contributions may be obtained from other codes.
2. Finite burst duration from the accelerator.
3. Finite electronic time resolution of the detector.
4. Finite thickness of the neutron target.

Running time:
Six seconds plus 17 ms per scatterer volume element.