63 research outputs found
Construction of Filled Hill for Downhill Ski Racing Complex in Moscow
In 1997-2002 large scope soil excavations for construction of Business Center âMoscow-Cityâ, Third Highway Circle and other large structures with deep foundations were carried out in Moscow. The soil excavated out of 180,000.00 mÂł pits was dumped on a disposal site originally designed as a temporary soil storage site in the Southwestern suburbs of Moscow. Snow, ice and clots of frozen soil were left untouched and piling was effected over the frozen surface. This spoil heap was a mass of exceedingly wet sandy clay heterogeneous as to composition and density with low strength and deformation properties, including crushed concrete and bricks and tended to land sliding and self-compaction deformations. Erection of the hill can be divided into four stages, judging by differences in physic-mechanical properties of soils down the depth of the embankment (Fig. 1). Upon fulfillment of the 2nd stage of excavation (Fig. 1 âbâ) at the end of the year 2001 the absolute mark of the top of the slope has reached 222 m, with the natural relief surface mid-mark making 177-178 m prior to heap excavation, and a heap height from its cone base has made 45 m. At the same time it was decided to use that hill as a standing ski-racing complex with a ski-jump. At the stage âbâ (Fig. 1) prospectors have made studies of physic-mechanical properties of the entire mass of fill-up soils and natural lower stratum as well by well-boring and static probing of soils for the ski-racing complex project design
On the reliability of the theoretical internal conversion coefficients
Possible sources of uncertainties in the calculations of the internal
conversion coefficients are studied. The uncertainties induced by them are
estimated.Comment: 16 pages (including 3 figures inserted by 'epsfig' macro
Image and Spectrum of the Sun in the Region 9.5-200 Angstrom
Short wave ultraviolet image and spectrum of sun obtained during course of X-ray flar
Deuteron tensor polarization component T_20(Q^2) as a crucial test for deuteron wave functions
The deuteron tensor polarization component T_20(Q^2) is calculated by
relativistic Hamiltonian dynamics approach. It is shown that in the range of
momentum transfers available in to-day experiments, relativistic effects, meson
exchange currents and the choice of nucleon electromagnetic form factors almost
do not influence the value of T_20(Q^2). At the same time, this value depends
strongly on the actual form of the deuteron wave function, that is on the model
of NN-interaction in deuteron. So the existing data for T_20(Q^2) provide a
crucial test for deuteron wave functions.Comment: 11 pages, 3 figure
Lamb shift in muonic deuterium atom
We present new investigation of the Lamb shift (2P_{1/2}-2S_{1/2}) in muonic
deuterium (mu d) atom using the three-dimensional quasipotential method in
quantum electrodynamics. The vacuum polarization, nuclear structure and recoil
effects are calculated with the account of contributions of orders alpha^3,
alpha^4, alpha^5 and alpha^6. The results are compared with earlier performed
calculations. The obtained numerical value of the Lamb shift 202.4139 meV can
be considered as a reliable estimate for the comparison with forthcoming
experimental data.Comment: 24 pages, 11 figures. arXiv admin note: text overlap with
arXiv:hep-ph/061229
Analytical Form of the Deuteron Wave Function Calculated within the Dispersion Approach
We present a convenient analytical parametrization of the deuteron wave
function calculated within dispersion approach as a discrete superposition of
Yukawa-type functions, in both configuration and momentum spaces.Comment: 3 pages, 2 figure; several minor corrections adde
Creation and decay of eta-mesic nuclei
First experimental results on photoproduction of eta-mesic nuclei are
analyzed. In an experiment performed at the 1 GeV electron synchrotron of the
Lebedev Physical Institute, correlated pi+n pairs arising from the reaction
gamma + 12C -> N + eta(A-1) -> N + pi+ + n + (A-2) and flying transversely to
the photon beam have been observed. When the photon energy exceeds the
eta-meson production threshold, a distribution of the pi+n pairs over their
total energy is found to have a peak in the subthreshold region of the
internal-conversion process eta p -> pi+ n which signals about formation of
eta-mesic nuclei.Comment: 6 pages, 6 figures. Talk at CIPANP, May 2000, Quebe
Ground State Hyperfine Structure of Muonic Helium Atom
On the basis of the perturbation theory in the fine structure constant
and the ratio of the electron to muon masses we calculate one-loop
vacuum polarization and electron vertex corrections and the nuclear structure
corrections to the hyperfine splitting of the ground state of muonic helium
atom . We obtain total result for the ground state hyperfine
splitting MHz which improves the previous
calculation of Lakdawala and Mohr due to the account of new corrections. The
remaining difference between the theoretical result and experimental value of
the hyperfine splitting equal to 0.522 MHz lies in the range of theoretical
error and requires the subsequent investigation of higher order corrections.Comment: Talk presented at the scientific session-conference of Nuclear
Physics Department RAS "Physics of fundamental interactions", 25-30 November
2007, ITEP, Moscow, 18 pages, 5 figure
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