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Full-Text Articles in Physical Sciences and Mathematics
An Improved Flexible Neutron Detector For Powder Diffraction Experiments, Thomas Kevin Mcknight
An Improved Flexible Neutron Detector For Powder Diffraction Experiments, Thomas Kevin Mcknight
Theses and Dissertations
Large amounts of money are being applied to the construction of the next generation of spallation sources for neutron scattering. Neutron powder diffraction instruments will be an important element of these facilities and the incorporation of detectors into these instruments with a high neutron capture efficiency is desirable. A new detector design named the Flexible Embedded Fiber Detector (FEFD) has been developed and tested for this thesis. This detector is based on wavelength shifting fibers embedded in a zinc-sulfide lithium-fluoride based scintillator. The virtue of this design is that the detecting surface can be curved around the Debye-Scherrer rings. This …
Novel Neutron Detector For N-N Scattering Length Measurement, Eva Wilcox
Novel Neutron Detector For N-N Scattering Length Measurement, Eva Wilcox
Theses and Dissertations
The neutron-neutron (n-n) scattering length is a fundamental parameter in nuclear physics; however, measurements are plagued with large uncertainties caused by neutron detector cross talk. Many experimentalists also rely upon computer code to calibrate their neutron detectors. Experiments give one of two different numbers but there is still no adequate explanation for this discrepancy. We have developed a new neutron detector expressly for the purpose of improving the n-n scattering length measurement. It offers two important advantages: 1) minimal cross talk and 2) high counting efficiency. We calibrated the detector from 1 MeV to 6 MeV at 1 MeV increments. …