Zobrazeno 1 - 10
of 12
pro vyhledávání: '"M Hood"'
Publikováno v:
Environmental Research Letters. 13:113004
Publikováno v:
Journal of Physics F: Metal Physics. 17:1817-1831
BaF2 detectors have been utilised to obtain extremely precise lifetime data for annealed Al in the range of 293-903 K, and for Al, electron-irradiated at T
Publikováno v:
Journal of Physics C: Solid State Physics. 19:4729-4740
The two-magnon spectrum of the nearest-neighbour Heisenberg ferromagnet on a square lattice is studied. An exact Green function formalism is used to obtain the spectral functions at zero temperature. The lattice Green functions of this system are wri
Autor:
R J Schultz, G M Hood
Publikováno v:
Journal of Physics F: Metal Physics. 10:545-558
High-precision measurements of the temperature dependence of positron annihilation in Al, over the range 290-930K, have been made via the Doppler-broadening technique and using an internal 68Ge positron source. The results are considered mainly in te
Autor:
G M Hood, B T A McKee
Publikováno v:
Journal of Physics F: Metal Physics. 8:1457-1465
Experimental data describing the equilibrium temperature dependence of positron annihilation in Cu, Ag, Au, Zn, Cd, Al and Pb are considered in terms of the simple trapping model. The results show that there is a correlation between a temperature, Tv
Autor:
G M Hood, R J Schultz
Publikováno v:
Journal of Physics F: Metal Physics. 12:2797-2803
Doppler-broadening measurements of positron annihilation in quenched single-crystal Al-1.5*10-2at%Si show a reversible temperature dependence of the annihilation characteristics which varies according to the defect state of the crystal. This effect s
Autor:
M Hood
Publikováno v:
Journal of Physics C: Solid State Physics. 16:4655-4662
The neutron scattering cross section and neutron polarisation for scattering by single magnons are calculated for a ferromagnetic Heisenberg Hamiltonian with various kinds of anisotropy. Although in a one-magnon theory if it is not possible to distin
Autor:
M Hood, B. W. Southern
Publikováno v:
Journal of Physics A: Mathematical and General. 19:2679-2684
The density of states of a quadratic Hamiltonian, with some anisotropy in the interactions, on a Sierpinski gasket in two dimensions is calculated. It is shown that the isotropic gasket is special in that the spectrum is composed of two distinct part
Publikováno v:
Journal of Physics F: Metal Physics. 4:343-350
Measurements have been made of the positron annihilation coincidence counting rate at the peak position in aluminum and in an Al-0.27 at% Si alloy as a function of temperature from 25 degrees C to 600 degrees C. The results were analysed according to
Autor:
M Hood
Publikováno v:
Journal of Physics C: Solid State Physics. 17:1367-1373
The author calculates the spin-wave damping and studies the two-spin-wave bound states for a one-dimensional Heisenberg ferromagnet with an easy-plane single-site anisotropy, in the presence of an external magnetic field in the easy plane, using an e