Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 1677 for “"neutron"”.
-
Investigation by neutron diffraction utilizing white neutron radiation
"The most probable reactor core neutron velocity was determined by analysis of data obtained from single crystals of copper and lithium fluoride. Derivation of the relationship between the maximum in experimental count rate and the most probable velocity, an error analysis of the method, and the …
-
Neutron-neutron angular correlation in 252Cf spontaneous fission
The angular correlation between prompt neutrons emitted in 252 cf spontaneous fission has been measured. The observed correlation is compared with a theoretical calculation based on the evaporation model of neutron emission. It is found that the evaporation model is unable to account for the …
-
Characterization of neutron fields around an intense neutron generator
Neutron fields in the vicinity of the University of Ontario Institute of Technology neutron facility have been investigated in a series of simulations and experiments. The neutron fluence at several locations around the neutron generator facility has been simulated using MCNPX 2.7E Monte Carlo …
-
Biological dosimetry of neutron beams for neutron capture therapies
Boron neutron capture therapies using the 10B(n,a)7Li reaction have been proposed as treatments for glioblastoma multiforme, metastatic melanoma, rheumatoid arthritis, and other debilitating conditions. This thesis presents the first combined biological and physical dosimetry interbeam comparison …
-
Neutron transfer reactions
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
-
Neutron radiographic methods
… the reactor at V.P.I. to provide a satisfactory neutron supply for neutron radiography. Several different specimens including low Z materials and heavier materials such as iron have been used as test objects. The effects of alternate methods of obtaining the radiographs and of the different …
-
Measurement of the Neutron-Neutron Quasifree Scattering Cross Section in Neutron-Deuteron Breakup at 10.0 and 15.6 MeV
<p>Neutron-neutron (nn) quasifree scattering (QFS) in neutron-deuteron (nd) breakup is the kinematic configuration in which the proton remains at rest in the laboratory frame. The cross section for this process is sensitive to the 1S0 component of the nn interaction. Recent measurements of the …
-
Neutron exposure and neutron flux in Asymptotic Giant Branch stars: a study of neutron capture cross sections of Zr isotopes
… This work concerns the measurements of the neutron capture cross sections of 90,91,92,93,94,96Zr isotopes, performed at the time-of-flight facilities n_TOF at CERN and GELINA at IRMM and their implication in stellar modeling.
-
Neutron Response Vectorization and Optimization of Moderating Neutron Spectrometers for Active Interrogation
… two improvements to multi-detector moderating neutron spectrometers in order to exploit all of these SNM signature parameters: time, energy, and space. The two new methods are: 1) an energy-specific optimization method for application driven spectrometer design via virtual detector simulations …
-
A Magneto-Gravitational Neutron Trap for the Measurement of the Neutron Lifetime
Neutron decay is the simplest example of nuclear beta-decay. The mean decay lifetime is a key input for predicting the abundance of light elements in the early universe. A precise measurement of the neutron lifetime, when combined with other neutron decay observables, can test for physics beyond …
-
Integral Testing of Neutron Cross-Sections Using Simultaneous Neutron Andgamma-Ray Measurements
Made available in DSpace on 2014-12-14T06:26:03Z (GMT). No. of bitstreams: 1 7714964.pdf: 3164131 bytes, checksum: 9a67f4994acfcb539c21b5d529b4bc5d (MD5) Previous issue date: 1977
-
Grazing angle neutron diffraction
… and practical implementation of grazing-angle neutron diffraction as a new method of non-destructive surface and interface analysis. Diffraction in the grazing-angle geometry with x rays and neutrons possesses two unique advantages over specifically surface-sensitive methods for structure …
-
Fast neutron scattering analysis
The scattering of a beam of fast monoenergetic neutrons is used to determine elemental compositions of small (0.2-1 kg) samples of materials. Particular emphasis is placed on the measurement of concentrations of the elements H, C, N and O, which are the principal constituents of contraband …
-
Accelerator-Based Neutron Branchytherapy
… modality of radiation therapy, Accelerator-Based Neutron Brachytherapy (ABNBT), has been demonstrated through simulations and experimental work. The candidate nuclear reactions investigated are 9Be(d,n)'OB, 9Be(p,n)9B, and 7Li(p,n)7Be, with charged particle beam energies of less than 4.1 MeV. The …
-
Neutron spin-pendellösung resonance
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1987.
-
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 …
Page 1 of 84