Showing papers in "Jetp Letters in 1981"

Quantum Fluctuations and a Nonsingular Universe

Abstract: Over a finite time, quantum fluctuations of the curvature disrupt the nonsingular cosmological solution corresponding to a universe with a polarized vacuum. If this solution held as an intermediate stage in the evolution of the universe, then the spectrum of produced fluctuations could have led to the formation of galaxies and galactic clusters.

Quantum size effect in three-dimensional microscopic semiconductor crystals

Abstract: The exciton absorption spectrum of microscopic CuCl crystals grown in a transparent dielectric matrix has been studied The size of the microscopic crystals was varied in a controlled manner from several tens of angstroms to hundreds of angstroms There is a short-wave shift (of up to 01 eV) of the exciton absorption lines, caused by a quantum size effect

Superheavy magnetic monopoles and decay of the proton

Abstract: A possible pronounced nonconservation of baryon number in interactions involving magnetic monopoles is discussed in a unified theory with SU (5) gauge group. Possible experimental consequences of this nonconservation are examined.

Approximate motion integral for a hydrogen atom in a magnetic field

Abstract: It is shown that the Schroedinger equation for highly excited states of a hydrogen atom in a magnetic field H allows a separation of variables (within an accuracy of H/sup 4/) in elliptical-cylindrical coordinates on a sphere in a four-dimensional momentum space. A new classification and approximate selection rules are proposed for these states.

Stochasticity of classical Yang-Mills mechanics and its elimination by using the Higgs mechanism

Abstract: The Higgs mechanism eliminates stochasticity of the Yang-Mills classical mechanics observed by Matinyan, Savvidi, and Ter-Arutyunyan-Savvidi )Zh Eksp Teor Fiz 80, 830 (1981) (Sov Phys JETP 53, 421 (1981))) The phase transition occurs at the critical value of the parameter (pi/sub c/roughly-equal015), which characterizes the Yang-Mills-Higgs system

Radiative slowing and reduction of the energy spread of a beam of sodium atoms to 1. 5 K in an oppositely directed laser beam

Abstract: A reduction of the velocity spread of a beam of sodium atoms has been observed experimentally as the beam was slowed by an oppositely directed resonant laser beam. Over an effective slowing distance of 20 cm, the longitudinal velocity distribution of the atomic beam was contracted by a factor of 19; correspondingly, the relative-motion temperature of the atoms was lowered to 1.5 K.

Production of High-Energy Colliding gamma gamma and gamma e Beams with a High Luminosity at Vlepp Accelerators

Abstract: Colliding ..gamma gamma.. and ..gamma..e beams with an energy and luminosity of the same order of magnitude as for e/sup +/e/sup -/ beams can be produced by scattering a laser light at the accelerators with colliding e/sup +/e/sup -/ beams with an energy > or approx. =100 GeV. Such accelerators are currently in the design stage.

Difference in the yields of even and odd Yb isotopes in multistep photoionization by polarized laser beams

Abstract: The polarization of the laser beams has been found to affect the yields of even and odd Yb isotopes from a natural isotopic mixture in selective three-step photoionization through a Rydberg state. The experimental results are interpreted.

Color dynamics in hadron diffraction by nuclei

Abstract: The interaction eigenstates in quantum chromodynamics are states of the incident hadron with certain values of the color transverse dipole moment. Accordingly, a sum can effectively be taken over all the corrections for inelastic screening of the hadron--nucleus diffraction amplitude.

Transfer processes in stochastic magnetic fields. Hydrodynamic approach

Abstract: An estimate is obtained for the energy flow across magnetic surfaces that have been destroyed because of a ''shivering'' of the magnetic-field lines of force. It is shown that the electron thermal conductivity in tokamaks is given by the Ohkawa formula.

Experimental study of P-parity nonconservation in the neutron resonance of /sup 117/Sn

Abstract: Nonconservation of space parity has been detected in the 1.33-eV p resonance of /sup 117/Sn. A value P(E/sub p/) = (4.5 +- 1.3) x 10/sup -3/ has been obtained at the resonance for the ratio of the difference in the cross sections with opposite helicities (sigma/sub +/-sigma/sub -/) to their sum (sigma/sub +/+sigma/sub -/).

Study of the neutrino mass in a double β decay

Abstract: Experiments on the search for the 2..beta.. decay, which can yield unique information on the presence of a Majorana mass in a neutrino and a possible nonconservation of lepton number are proposed. A search for 2..beta../sup +/ decays is especially promising in view of the possibility of a pure isolation of the coincidence signal of four annihilation ..gamma..-ray quanta.