8,446 research outputs found
Coordinate space proton-deuteron scattering calculations including Coulomb force effects
We present a practical method to solve the proton-deuteron scattering problem
at energies above the three-body breakup threshold, in which we treat
three-body integral equations in coordinate space accommodating long-range
proton-proton Coulomb interactions. The method is examined for phase shift
parameters, and then applied to calculations of differential cross sections in
elastic and breakup reactions, analyzing powers, etc. with a realistic
nucleon-nucleon force and three-nucleon forces. Effects of the Coulomb force
and the three-nucleon forces on these observables are discussed in comparing
with experimental data.Comment: 15 pages, 14 figures, submitted to PR
A survey of the three-dimensional high Reynolds number transonic wind tunnel
The facilities for aerodynamic testing of airplane models at transonic speeds and high Reynolds numbers are surveyed. The need for high Reynolds number testing is reviewed, using some experimental results. Some approaches to high Reynolds number testing such as the cryogenic wind tunnel, the induction driven wind tunnel, the Ludwieg tube, the Evans clean tunnel and the hydraulic driven wind tunnel are described. The level of development of high Reynolds number testing facilities in Japan is discussed
Comment on "White-Noise-Induced Transport in Periodic Structures"
In the paper by J.\L uczka {\em et al.} ({\em Europhys. Lett.}, {\bf 31}
(1995) 431), the authors reported by rigorous calculation that an additive
Poissonian white shot noise can induce a macroscopic current of a dissipative
particle in a periodic potential -- even {\em in the absence} of spatial
asymmetry of the potential. We argue that their main result is an obvious one
caused by the spatially broken symmetry of a probability distribution of the
additive noise, unlike the similar result caused by chaotic noise which has a
symmetric probability distribution ({\em J.Phys.Soc.Jpn.}, {\bf 63} (1994)
2014).Comment: 2 pages (Latex); submitted to Europhys.Let
Results of a Search for Paraphotons with Intense X-ray Beams at SPring-8
A search for paraphotons, or hidden U(1) gauge bosons, is performed using an
intense X-ray beamline at SPring--8. "Light Shining through a Wall" technique
is used in this search. No excess of events above background is observed. A
stringent constraint is obtained on the photon--paraphoton mixing angle, for .Comment: 10 pages, 4 figure
Inverse versus Normal NiAs Structure as High-Pressure Phase of FeO and MnO
The high-pressure phases of FeO and MnO were studied by the first principles
calculations. The present theoretical study predicts that the high-pressure
phase of MnO is a metallic normal B8 structure (nB8), while that of FeO should
take the inverse B8 structure (iB8). The novel feature of the unique
high-pressure phase of stoichiometric FeO is that the system should be a band
insulator in the ordered antiferromagnetic (AF) state and that the existence of
a band gap leads to special stability of the phase. The observed metallicity of
the high-pressure and high-temperature phase of FeO may be caused by the loss
of AF order and also by the itinerant carriers created by non-stoichiometry.
Analysis of x-ray diffraction experiments provides a further support to the
present theoretical prediction for both FeO and MnO. Strong stability of the
high-pressure phase of FeO will imply possible important roles in Earth's core.Comment: 7 pages, 3 figures and 1 table; submitted to "Nature
Excitation spectrum of Bilayer Quantum Hall Systems
Excitation spectra in bilayer quantum Hall systems at total Landau-level
filling are studied by the Hartree-Fock-Bogoliubov approximation. The
systems have the spin degrees of freedom in addition to the layer degrees of
freedom described in terms of pseudospin. On the excitation spectra from
spin-unpolarized and pseudospin-polarized ground state, this approximation
fully preserves the spin rotational symmetry and thus can give not only
spin-triplet but also spin-singlet excitations systematically. It is also found
that the ground-state properties are well described by this approximation.Comment: 5 pages, 3 figures; conference: EP2DS-1
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