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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"Neutron spectrometer"”.
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A fast neutron spectrometer
A fast neutron spectrometer was designed and constructed using a proton-recoil telescope. Recoil protons from a thin foil of polyethylene were detected with a silicon surface-barrier diode. The output pulse from the detector is proportional to the energy of the protons and hence the energy of the …
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A new compact neutron spectrometer
A new compact neutron spectrometer has been designed, developed and characterized. The detector is based on EJ299-33 plastic scintillator coupled to silicon photomultipliers, and a digital implementation of pulse shape discrimination is used to separate events associated with neutrons from those …
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A compact neutron spectrometer for detecting neutrons produced by cosmic rays
The high energy secondary neutron fields from cosmic radiation that are found in aviation and space environments have impacts on both biological and technological systems. A compact neutron spectrometer that is safe to operate in an aviation environment and suitable for detecting these secondary …
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The M. I. T. linear accelerator as a pulsed neutron source for a time-of-flight neutron spectrometer
Thesis (B.S.) Massachusetts Institute of Technology. Dept. of Physics, 1951.
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Use of silicon surface-barrier detectors for neutron detection
… solid stets surface-barrier detectors employed neutron detectors. This research also had the ultimate aim of showing the possibility of producing a neutron spectrometer using the proton recoil telescope with the surface-barrier detector. These objects were fulfilled. From the results with the …
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A Novel Neutron Recoil Spectrometer Concept Utilizing Heavy-Ion Recoils and Time- and Spatially-Resolved Sensor
This thesis describes a heavy-ion recoil neutron spectrometer as an alternative to existing magnetic proton recoil neutron spectrometers for inertial confinement fusion experiments. Whereas existing designs elastically scatter neutrons o↵ protons or deuterons, which are then magnetically analyzed …
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Measurement of neutron radiotherapy spectra in a tissue-equivalent phantom
… was investigated for determining the changes in neutron radiotherapy spectra with position within a tissue-equivalent phantom at the National Accelerator Centre in the energy range 0 to 63 MeV. An deuterated liquid scintillator (NE230) was used as the neutron spectrometer for these measurements. …
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A neutron diffraction spectrometer
A single crystal neutron spectrometer using a copper crystal has been designed and constructed for the purpose of studying the low energy (<1 ev) neutron spectrum from the V.P.I. reactor. The basic theory necessary for the design, the details of the spectrometer, calibration data and method of …
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Design of Instrumentation and Methodologies for Determination of Free Neutron Characteristics
Measuring neutron source‐dependent free neutron properties over a large neutron energy range, with human‐portable instrumentation, continues to push the frontier of neutron detection instrumentation design and analysis techniques. In addition, a variety of nuclear nonproliferation and health …
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Investigation of non-normal incidence charged-particle response of CR39 nuclear track detectors, with applications in nuclear diagnostics for inertial confinement fusion
… at an angle is essential to designing a D-D neutron spectrometer at the Z facility, which uses CR39 to detect protons incident at an angle. We find that small adjustments of 10 degrees have no effect on detection efficiency, and high detection efficiency is preserved up through 25 degrees in …
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Determination of neutron energy spectra inside a water phantom irradiated by neutrons of energy up to ~ 64 Me V
A neutron spectrometer based on an NE230 deuterated organic liquid scintillator (25 mm diameter x 25 mm) has been developed for measuring neutron spectra in water. The spectrometer is capable of measuring neutron energies above 5 MeV, set by the electronic threshold. An important feature of the …
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Neutron Compton scattering from hydrogen and perovskite oxide interfaces
… thesis we investigate two independent topics: neutron Compton scattering from hydrogen and perovskite oxide interfaces. Part one is an investigation of the scattering of high energy neutrons from hydrogen compounds. The motivation for this investigation stems from neutron Compton scattering …
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A Study of the Elastic Scattering of Fast Neutrons by Potassium and lithium
The elastic scattering of fast neutrons by 39K and 7Li has been studied at an incident neutron energy of 14.1 MeV, using a neutron spectrometer employing the associated particle time of flight technique. The source neutrons were produced by the 3H(d,n) 4He reaction at an incident deuteron energy of …
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Diagnosing inertial confinement fusion implosions at OMEGA and the NIF Using novel neutron spectrometry
A novel neutron spectrometer, called the Magnetic Recoil Spectrometer (MRS), was designed, built, and implemented on the OMEGA laser facility and the National Ignition Facility (NIF) to measure the neutron spectra from inertial confinement fusion (ICF) implosions. Using the MRS, the down-scattered …
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Development and use of advanced nuclear diagnostics and neural networks to diagnose 3D morphology and power balance in inertial fusion implosions at OMEGA and NIF
… diagnostics that probe asymmetries, such as the neutron imaging system, the real-time neutron activation detectors, and the neutron time-of-flight spectrometers. Our technique uses a forward-fit to a simplified physics model to produce a single self-consistent 3D picture of the implosion. Markov …
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Specific Heat and Thermodynamic Properties of Metallic Systems: Instrumentation and Analysis
… of a larger project in the construction of a neutron spectrometer. For this application, the measured specific heats were used to extrapolate the specific heats down to 0.1 K with lattice, electronic, and Schottky equations for the respective samples. The resultant specific heat values at 0.1 …
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A new approach to neutron spectrometry with multi-element scintillators
… design and performance. Currently, there is no neutron dosimeter/spectrometer that can meet the requirements in terms of size and performance. In particular, the requirements for high sensitivity, spectroscopic features, and determination of operational quantities to enable radiation protection …
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