The molecular dynamics method is used to simulate the formation of ultracold plasma under continuous ionizing irradiation in a quadrupole magnetic field with the gradient of the magnetic field along ...the axis of symmetry equal to 0, 30, 150, and 500 G/cm. An increase in the magnetic field promotes an increase in the plasma density owing to the trapping of some part of fast electrons by the quadrupole magnetic field.
The formation of a two-component steady-state nonideal ultracold plasma using an ionizing cw laser is directly simulated. It is shown that, in much the same way as the case of pulse ionization, the ...formation of steady-state plasma is determined by the electric field created by fast electrons leaving the plasma. This field accelerates ions and keeps remaining electrons within the plasma. In this case, continuous ionization results in the fast formation of a steady-state density and temperature distribution of plasma particles, which can exist for a long time, at a certain time, which depends on the initial energy of electrons and ions, as well as on the plasma density.
We present simulation results of ultracold Sr plasma expansion in a quadrupole magnetic field by means of molecular dynamics. An analysis of plasma evolution influenced by a magnetic field is given. ...Plasma confinement time behavior under variation of magnetic field strength is estimated. Similarity of the time dependence of the concentration and distribution of ion velocities against the parameters of the plasma and magnetic field is established. Simulation results are in agreement with the experimental ones.
The tensor analyzing power components T20 and T21 have been measured in elastic electron-deuteron scattering at the 2 GeV electron storage ring VEPP-3, Novosibirsk, in a four-momentum transfer range ...from 8.4 to 21.6 fm(-2). A new polarized internal gas target with an intense cryogenic atomic beam source was used. The new data determine the deuteron form factors G(C) and G(Q) in an important range of momentum transfer where the first node of the deuteron monopole charge form factor is located. The new results are compared with previous data and with some theoretical predictions.
This work is devoted to the molecular dynamic calculations of the properties of technical gases, whose study is a traditional problem of physics of matter. At present, there is increased interest in ...this problem due to the development of nanotechnologies and their introduction in various industries. The gases’ properties required for simulation are expressed as a set of macroparameters, including kinetic coefficients; parameters of the equation of state; and values of kinetic, potential, total, and internal energies. The study was performed for technical gases such as argon, hydrogen, nitrogen, and methane at a pressure of 1 atm and in the temperature range from 100 to 400 K. The obtained calculated data on the macroparameters of gases is in good agreement with the known theoretical estimates and experimental data.
Azimuthal single-spin asymmetries of leptoproduced pions and charged kaons were measured on a transversely polarized hydrogen target. Evidence for a naive-T-odd, transverse-momentum-dependent parton ...distribution function is deduced from nonvanishing Sivers effects for pi(+), pi(0), and K(+/-), as well as in the difference of the pi(+) and pi(-) cross sections.
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