• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 17
  • 3
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • Tagged with
  • 48
  • 48
  • 11
  • 7
  • 6
  • 5
  • 5
  • 4
  • 4
  • 4
  • 4
  • 4
  • 4
  • 3
  • 3
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

The polarization of neutrons from the C¹³(p,n₀)N¹³ and N¹⁵(p,n₀)O¹⁵ reactions

Walker, Bryan Dale. January 1964 (has links)
Thesis (Ph.D.)--University of California, Berkeley, 1964. / "Physics, UC-34" -t.p. "TID-4500 (30th Ed.)" -t.p. Includes bibliographical references (p. 54-56).
12

Neutron scattering by non-stoichiometric compounds

Childs, Eric Peter January 1967 (has links)
No description available.
13

Production of a well collimated neutron beam using the associated particle technique

Tripard, Gerald Edward January 1967 (has links)
An accurately colliraated monenergetic fast neutron beam of small angular width was produced by bombarding a deuterium target with 2 MeV deuterons. Background reduction was achieved by using the associated particle technique and extensive shielding. Dual parameter pulse height analysis was used to reduce the coincidence time resolution between the detected neutrons and the associated He³ recoil particle to 4.6 nanoseconds by taking into account the variations in flight times of the He³ particles. A rotating thin film deuterated polyethylene target was developed which enabled a substantial increase in the neutron flux to be made. The beam of 70 neutrons/second/millisteradian produced, was of sufficient intensity to perform a small angle scattering experiment. The technique was tested by a measurement of the angular distribution from 40 degrees to 10 degrees of neutrons elastically scattered from lead. / Science, Faculty of / Physics and Astronomy, Department of / Graduate
14

The attenuation of very cold neutrons by titanium foil /

Gabriel, Philip Demitri. January 1981 (has links)
No description available.
15

Studies of disordered inorganic systems by neutron scattering

Barrett, Stephen Andrew January 1978 (has links)
No description available.
16

High energy neutron-nucleus total cross sections with inelastic shielding

Diamond, David Maurice. January 1977 (has links)
No description available.
17

High energy neutron-nucleus total cross sections with inelastic shielding

Diamond, David Maurice. January 1977 (has links)
No description available.
18

A neutronic study of an intense epithermal neutron source based on the ⁹BE(P,N) ⁹B reaction for neutron capture therapy

Moore, Brian Randolph 08 1900 (has links)
No description available.
19

The elements of neutron interaction theory.

January 1971 (has links)
No description available.
20

Neutron scattering studies of fluorite oxides at high temperatures

Macdonald, John Emyr January 1985 (has links)
The high temperature behaviour of the fluorite oxides UO<sub>2</sub>, THO<sub>2</sub> and Y<sub>2</sub>O<sub>3</sub>-stabilised ZrO <sub>2</sub> have been investigated using a variety of neutron scattering techniques. Interest has centred on the cause of the anomalously large enthalpy of UO<sub>2</sub> at temperatures above 15OOK, an understanding of which is important in view of its use as a fission reactor fuel. High temperature techniques have been developed which enable the performance of neutron scattering at temperatures up to 3OOOK. Bragg diffraction measurements have shown that a growing fraction of anions vacate their regular sites above 21OOK in UO<sub>2</sub> and above 23OOK in ThO<sub>2</sub> attaining vacancy concentrations of ~2O% at 29OOK in both materials. Quasielastic scattering investigations have confirmed the occurrence of anion Frenkel disorder in UO2 at high temperatures and have shown that the disorder is of a dynamic nature. Both sets of results may be interpreted in terms of fluctuating, dynamic clusters of vacancies and inter stitials, having lifetimes of a few phonon periods. The elastic constants of UO<sub>2</sub>, which have been determined up to 293OK from measurements of the long wavelength acoustic phonons, show an increased rate of softening above 24OOK. The zone-centre optic phonons broaden rapidly above 2OOOK in UO<sub>2</sub>- The full phonon dispersion relation of ThO<sub>2</sub>, measured at 293K, resembles closely that of UO<sub>2</sub>. The results provide the first direct, unambiguous evidence of thermally-induced Frenkel disorder in UO<sub>2</sub>, which is analogous to the disorder observed in the fast-ion phase of the fluorite halides, such as CaF<sub>2</sub>. Quasielastic scattering techniques have also been used to study the defect structure of Y <sub>2</sub>O <sub>3</sub> -stabilised ZrO <sub>2</sub> between 293K and 2OOOK. Many general features of the scattering observed at room temperature may be explained in terms of nearest neighbour relaxations around oxygen vacancies. The diffuse scattering broadens in energy above 1OOOK, signifying that these clusters of relaxed ions have a finite lifetime of ~5ps at 15OOK. The results have been interpreted in terms of a vacancy hopping model which is consistent with the enhanced conductivity observed in this temperature range.

Page generated in 0.0827 seconds