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Fast Photoneutron Detection

Rofors, Emil LU (2016) PHYM01 20151
Department of Physics
Nuclear physics
Abstract
The purpose of this project was to investigate fast photoneutron production from a
series of materials commonly used for backing neutron beam guides. Fast neutrons
were knocked out of these materials by exposing them to to high-energy photons at
the Tagged-Photon Facility at MAX-lab in Lund, Sweden. Liquid scintillator detectors
at different angles around the targets registered the photoknockout neutrons. These
fast-neutron detectors were energy calibrated using two well-understood gamma-ray
sources. The energy calibrations were used to establish the hardware detector thresh-
olds. The hardware thresholds server as input to an absolute neutron-detection efficiency
Monte Carlo simulation known as STANTON, which was used to establish... (More)
The purpose of this project was to investigate fast photoneutron production from a
series of materials commonly used for backing neutron beam guides. Fast neutrons
were knocked out of these materials by exposing them to to high-energy photons at
the Tagged-Photon Facility at MAX-lab in Lund, Sweden. Liquid scintillator detectors
at different angles around the targets registered the photoknockout neutrons. These
fast-neutron detectors were energy calibrated using two well-understood gamma-ray
sources. The energy calibrations were used to establish the hardware detector thresh-
olds. The hardware thresholds server as input to an absolute neutron-detection efficiency
Monte Carlo simulation known as STANTON, which was used to establish the best-case
neutron-detection efficiency achieved in the measurement. Finally, the detector thresh-
olds were increased in software to study the reduction in detection efficiency as a function
of the increase in threshold. A complete overview of the project is presented. (Less)
Popular Abstract
Neutrons are very small particles with no charge that you normally find in the nucleuses of atoms. Thanks to their lack of charge neutrons have very attractive properties when used to examine other materials. In this thesis a problem facing modern neutron sources, called spallation sources, is investigated.
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author
Rofors, Emil LU
supervisor
organization
course
PHYM01 20151
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Neutron, neutron detection, spallation, scintillator, Monte Carlo
language
English
id
8862543
date added to LUP
2016-03-18 16:04:55
date last changed
2016-03-18 16:04:55
@misc{8862543,
  abstract     = {The purpose of this project was to investigate fast photoneutron production from a
series of materials commonly used for backing neutron beam guides. Fast neutrons
were knocked out of these materials by exposing them to to high-energy photons at
the Tagged-Photon Facility at MAX-lab in Lund, Sweden. Liquid scintillator detectors
at different angles around the targets registered the photoknockout neutrons. These
fast-neutron detectors were energy calibrated using two well-understood gamma-ray
sources. The energy calibrations were used to establish the hardware detector thresh-
olds. The hardware thresholds server as input to an absolute neutron-detection efficiency
Monte Carlo simulation known as STANTON, which was used to establish the best-case
neutron-detection efficiency achieved in the measurement. Finally, the detector thresh-
olds were increased in software to study the reduction in detection efficiency as a function
of the increase in threshold. A complete overview of the project is presented.},
  author       = {Rofors, Emil},
  keyword      = {Neutron,neutron detection,spallation,scintillator,Monte Carlo},
  language     = {eng},
  note         = {Student Paper},
  title        = {Fast Photoneutron Detection},
  year         = {2016},
}