15,434 research outputs found
Field of sudden starts' main impulses near the local absorption region of cosmic radio-noise in the ionosphere
Main impulse fields of magnetic storm sudden starts near local absorption region of cosmic radio noise in ionospher
Was the Magnetic Wake Observed by ''IMP-1'' LUNAR or Terrestrial /ques/
Terrestrial magnetosphere influence on IMP-1 dat
Self-gravitating spheres of anisotropic fluid in geodesic flow
The fluid models mentioned in the title are classified. All characteristics
of the fluid are expressed through a master potential, satisfying an ordinary
second order differential equation. Different constraints are imposed on this
core of relations, finding new solutions and deriving the classical results for
perfect fluids and dust as particular cases. Many uncharged and charged
anisotropic solutions, all conformally flat and some uniform density solutions
are found. A number of solutions with linear equation among the two pressures
are derived, including the case of vanishing tangential pressure.Comment: 21 page
Strong dependence of multiphoton detachment rates on the asymptotic behaviour of the ground-state wave function
Two-photon detachment from the F-minus negative ion is investigated within
the lowest order of perturbation theory. We show that in accordance with the
adiabatic theory a proper asymptotic behaviour of the 2p bound state wave
function is crucial for obtaining correct absolute values of the multiphoton
detachment cross sections. We find that the latter are substantially higher
than it was previously believed.Comment: Latex IOP stile, plus 3 figures in PostScript file
Two-photon detachment of electrons from halogen negative ions
Absolute two-photon detachment cross sections and photoelectron angular
distribution are calculated for halogen negative ions within lowest-order
perturbation theory. The Dyson equation method is used to obtain the outer np
ground-state wave functions with proper asymptotic behavior exp (-k r),
corresponding to correct (experimental) binding energies E=k^2/2. The latter is
crucial for obtaining correct absolute values of the multiphoton cross sections
(Gribakin and Kuchiev 1997 Phys. Rev.A55 3760). Comparisons with previous
calculations and experimental data are performed.Comment: Latex, IOP stile, 22 pages, 8 figure
Radiation Emission by Electrons Channeling in Bent Silicon Crystals
Results of numerical simulations of electron channeling and emission spectra
are reported for straight and uniformly bent silicon crystal. The projectile
trajectories are computed using the newly developed module [1] of the MBN
Explorer package [2,3]. The electron channeling along Si(110) crystallographic
planes is studied for the projectile energy 855 MeV.Comment: 9 pages, 7 figures; submitted to European Physical Journal D. arXiv
admin note: text overlap with arXiv:1307.678
Internal Modes and Magnon Scattering on Topological Solitons in 2d Easy-Axis Ferromagnets
We study the magnon modes in the presence of a topological soliton in a 2d
Heisenberg easy-axis ferromagnet. The problem of magnon scattering on the
soliton with arbitrary relation between the soliton radius R and the "magnetic
length" Delta_0 is investigated for partial modes with different values of the
azimuthal quantum numbers m. Truly local modes are shown to be present for all
values of m, when the soliton radius is enough large. The eigenfrequencies of
such internal modes are calculated analytically on limiting case of a large
soliton radius and numerically for arbitrary soliton radius. It is demonstrated
that the model of an isotropic magnet, which admits an exact analytical
investigation, is not adequate even for the limit of small radius solitons,
R<<Delta_0: there exists a local mode with nonzero frequency. We use the data
about local modes to derive the effective equation of soliton motion; this
equation has the usual Newtonian form in contrast to the case of the easy-plane
ferromagnet. The effective mass of the soliton is found.Comment: 33 pages (REVTeX), 12 figures (EPS
- …