A high temporal resolution solid state thermal neutron detector
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Date
1994-02-09
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Publisher
Australian and New Zealand Institutes of Physics
Abstract
Neutron diffraction is a major method for investigation of material structure at a molecular level and has applications in investigation of metals, ceramics, polymers and organic molecules. There are two major methods, 1. diffraction using a monochromatic beam and 2. diffraction based on the Laue time-of-flight method.(1,2,3,4,5) The Laue time-of-flight technique has considerable advantage, due to the total utilisation of the neutrons. The integrated intensity of the Laue-spot from a single crystal in simple form (see formula in attachment). To extract structural information care has to be taken in evaluating λ since Rλ ∝ λ4 The design goal was to build a thermal-neutron detector capable of a time resolution at least two orders of magnitude better than that currently available .The thermal-neutron detector consists of a thin foil of Gadolinium on which a beam of thermal-neutrons is incident, and whose isotropically scattered internal conversion electrons (6) are detected by a Passivated Implanted Planar Silicon ( PIPS ) detector This detector will be incorporated in a time-of-flight diffractometer with much greater wavelength resolution, which will enable greater precision in determination of molecular structure of materials. The detector will also be applied (8, 9) to a new instrument currently being designed at HIFAR (8,9) based on the "Time Correlated Diffraction Method"(7).
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Keywords
Foils, Gadolinium, Laue method, Neutron diffraction, Solid scintillation detectors, Thermal neutrons, Time-of-flight method
Citation
McKean, N. S., Davis, R. L., Bartel, A., & Bakshi, E. N. (1994). A high temporal resolution solid state thermal neutron detector. Poster presented to the 18th Annual Condensed Matter Physics Meeting, Charles Sturt University, Wagga Wagga, NSW, 9-11 February 1994.