Rescattering corrections for measurements of neutron cross sections

Haan, Niels de (2024) Rescattering corrections for measurements of neutron cross sections. Bachelor's Thesis, Applied Physics.

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Abstract

The primary goal of this research is to develop and test a multiple neutron scattering correction factor in Geant4, applied to neutron scattering cross-section measurements from the ELISA setup at GELINA. Disc-shaped carbon targets of thicknesses of 2 mm and 10 mm are placed in a spin- unpolarized neutron beam (ranging from 1 to 8 MeV). This work replicates similar experimental research at the ELISA setup, Joint Research Centre, Geel, Belgium. The ELISA setup geometry is recreated in Geant4, and various physics lists are compared and analysed. Eight virtual detector rings replaced the four rows of eight detectors to test neutron detection efficiency improvement. The multiple scattering percentages are determined over the 1-8 MeV neutron-energy range, for each of the eight detector rings. Finally, the correction factors are computed and implemented on experimentally obtained neutron scattering cross section data from the ELISA setup. Overall, the High Precision neutron model proved to be crucial for obtaining accurate data. A drastic improvement of 700% on neutron detection efficiency was found subsequent to implementing the new detector configuration. Also, the correction factor showed to be improving the deviations for detector angles farther away from 90° and inaccurate for measurements done by detectors placed close to 90°.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Kalantar-Nayestanaki, N. and Palasantzas, G.
Degree programme:	Applied Physics
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	25 Jul 2024 10:08
Last Modified:	25 Jul 2024 10:08
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/33643

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