571 research outputs found
On the problem of synthesis of superheavy nuclei. A short historical review on first theoretical predictions and new experimental reality
It is shown that it is just Dubna that possesses the priority both in the
recent synthesis of a superheavy nucleus with charge Z = 114 (Flerov Laboratory
of Nuclear Reactions, JINR) and in its theoretical prediction (Bogoliubov
Laboratory of Theoretical Physics, JINR) made 33 years ago. Possible sizes of
the island of stability of superheavy nuclei are discussed.Comment: LaTeX, 6 page
Synthesis of Superheavy elements and Theory of Atomic Nucleus
The connection of synthesis of long-lived superheavy nuclei and existence of
the island of stability with the choice of realistic nuclear potential is
discussed: the behaviour of the average field of nuclei is an important element
of nuclear models. It is also shown that it is just Dubna that possesses the
priority both in the recent synthesis of a superheavy nucleus with charge Z=114
and in its theoretical prediction made 35 years ago. Possible sizes of the
island of stability of superheavy nuclei are considered.Comment: 14 pages . Talk at the Intern.Symp.on Exotic Nuclei . Baikal Lake,
July 24 -- 28, 200
Mechanosorption of Co2 by silicates: mechanism, kinetics and possible applications
Mechanically induced CO2 extensive sorption by silicate minerals (labradorite, diopside, okermanite, ghelenite, and wollastonite) has been considered. The silicates mechanically activated in CO2 atmosphere in a planetary mill AGO-2 have been characterized using XRD and IR spectroscopy. Micro- and nanostructure of material resulting from mechanochemical interaction of diopside with CO2 were investigated using SEM and TEM. The obtained data suggest that CO2 penetrates the structurally disordered silicate matrix and “dissolves” in the particles volume with formation of homogeneous carbonate-silicate phase. Equations that reasonably good represent kinetics of CO2 mechanosorption by the silicates have been proposed. These equations enable to calculate mechanosorption coefficients characterizing the diffusivity of CO2 into disordered silicate matrix under intensive mechanical impact. Correlations between CO2 content in mechanically activated silicates and CO2 solubility in the corresponding melts, as well as between mechanosorption coefficients and CO2 diffusion coefficients in the melts have been revealed. Possible application of the revealed effect in improving of alkali-activated ferrous-magnesium slag binding materials has been discussed
Study of High Energy Gamma-Quanta Beyond the Atmosphere
Measurements of primary cosmic radiation gamma quanta from Proton I and II satellite
Angular Schmidt Modes in Spontaneous Parametric Down-Conversion
We report a proof-of-principle experiment demonstrating that appropriately
chosen set of Hermite-Gaussian modes constitutes a Schmidt decomposition for
transverse momentum states of biphotons generated in the process of spontaneous
parametric down conversion. We experimentally realize projective measurements
in Schmidt basis and observe correlations between appropriate pairs of modes.
We perform tomographical state reconstruction in the Schmidt basis, by direct
measurement of single-photon density matrix eigenvalues.Comment: 5 pages, 4 figure
Optical spectroscopy using biphotons
The possibilities of spectroscopic investigations by means of correlated photon pairs (biphotons) generated in spontaneous parametric down-conversion are analyzed. It is shown that modulation of the single-photon wave packets allows one to determine the form of absorption line even if spectral width of that is much less than spectral resolution of monochromator
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