No abstract available

[en] A magneto-optical technique based on the Faraday effect is demonstrated to provide a simple, practical and accurate method of obtaining the line integral of a complicated magnetic field profile. (orig.)

[en] The polarization has been measured of ground state neutrons emitted from targets of light and heavy water. Bremsstrahlung of end point energies of 25 MeV and 30 MeV were used and neutrons were measured at angles of 135 deg and 90 deg to the photon beam. (author)

[en] A Comment on the Letter by A. Garg and D. Levine, Phys. Rev. Lett. 60, 2160 (1988)

[en] The spin dynamics of uranium ions in the non-Fermi liquid compounds URu_2-xRe_xSi₂, for x=0.2 to 0.6, have been investigated using inelastic neutron scattering. The wave vector (q) dependence of the magnetic scattering provides evidence of short-range antiferromagnetic correlations at low temperatures for x=0.2,0.25, but the scattering is nearly q independent at x=0.35,0.6. The magnetic response, (bar S)(ω), obtained from the q-independent part of neutron scattering, varies as ω^-α with a composition-dependent exponent α = 0.2-0.5. The dynamic magnetic susceptibility χ(double_prime)(q,ω) of the q-independent part exhibits ω/T scaling for the energy transfer (bar h)ω between 3.5 and 17 meV in the temperature (T) range of 5-300 K at all the compositions. This scaling, which indicates local quantum criticality, breaks down in the q range, 0.6-1.1 (angstrom)^-1 at x = 0.2 and 0.25, that is dominated by short-range antiferromagnetic correlations. The appearance of power laws in the magnetic response measured by inelastic neutron scattering over a wide Re doping region indicates a disorder driven non-Fermi liquid mechanism for the low-temperature physical properties in these compounds

[en] The magnetic phase diagram of Dy (T_N=179 K) shows the presence of two phases at elevated fields and temperatures, and these are presumed to be fan structures. Neutron scattering experiments were performed to determine the magnetic structures of these phases at 141, 149 and 172 K with magnetic fields between 0 and 1.8 T. It was found that the structures were characterized by two modulation wave vectors at 141 and 149 K and by only one modulation wave vector at 172 K. As the helical-fan-ferro structural changes occur, the satellite peak intensity shifts to the fundamental peaks. However, the sum of the peak intensities is not conserved because some of this intensity goes into a diffuse component covering a large range of wave vectors. The general features of the data are reproduced by a mean-field and Monte-Carlo calculations. (orig.)

[en] Legendre angular distribution coefficients, a₁, a₂, a₃ and a₄ for the reaction ⁴⁰Ca(γ,n₀)³⁹Ca have been measured. The data are compared with an RPA calculation based on a Skyrme III force. Also presented is a measurement of the Legendre angular distribution coefficients for the reaction ²H(γ,n)p. (orig.)

[en] A fitting procedure for separating the inelastic and elastic contributions to the total scattering in diffuse-scattering experiments at high energy using energy-dispersive X-ray techniques is presented. An asymmetric peak function is used to model the elastic peak. The inelastic scattering peak is modeled using a theoretical Compton profile, calculated using the impulse approximation (Hartree-Fock wave functions were used), convoluted with the detector resolution. This procedure, which requires only two free parameters, is shown to be extremely effective in extracting the integrated elastic intensity of coherent scattering at each wave vector, even at low scattering angles where the Compton scattering is not well resolved. (orig.)

[en] Four neutron guide geometries, straight, converging, diverging and curved, were characterized using Monte Carlo ray-tracing simulations. The main areas of interest are the transmission of the guides at various neutron energies and the intrinsic time-of-flight (TOF) peak broadening. Use of a δ-function time pulse from a uniform Lambert neutron source allows one to quantitatively simulate the effect of guides' geometry on the TOF peak broadening. With a converging guide, the intensity and the beam divergence increases while the TOF peak width decreases compared with that of a straight guide. By contrast, use of a diverging guide decreases the intensity and the beam divergence, and broadens the width (in TOF) of the transmitted neutron pulse

[en] This paper discusses the variety of teaching methods employed by the Nuclear Department in the education and training of nuclear practitioners in support of the United Kingdom's Naval Nuclear Propulsion Programme (NNPP). Reactor physics is required to be taught at a variety of levels from introductory principles to postgraduate, a variety of teaching methods are employed to satisfy this requirement. This paper will introduce all of these teaching methods but will focus on the use of computer-assisted learning. The three main computational tools Core XYZ, M32 and industry standards (WIMS, MONK and MCNP) will be described and examples of their application given. Some sample results and applications of industry standard codes from both the taught and dissertation phase of the Departments MSc. Nuclear Technology and Safety Management will be provided. (author)