Single photoeffect on helium-like ions in the non-relativistic region

We present a generalization of the pioneering results obtained for single K-shell photoionization of H-like ions by M. Stobbe [Ann. Phys. 7 (1930) 661] to the case of the helium isoelectronic sequence. The total cross section of the process is calculated, taking into account the correlation corrections to first order of the perturbation theory with respect to the electron-electron interaction. Predictions are made for the entire non-relativistic energy domain. The phenomenon of dynamical suppression of correlation effects in the ionization cross section is discussed.Comment: to be published in Physics Letters

Accurate spline solutions of the Dirac equation with parity-nonconserving potential

The complete system of the B-spline solutions for the Dirac equation with the parity-nonconserving (PNC) weak interaction effective potential is obtained. This system can be used for the accurate evaluation of the radiative corrections to the PNC amplitudes in the multicharged ions and neutral atoms. The use of the scaling procedure allows for the evaluation of the PNC matrix elements with relative accuracy $10^{-7}$.Comment: 7 page

Combined effect of coherent Z exchange and the hyperfine interaction in atomic PNC

The nuclear spin-dependent parity nonconserving (PNC) interaction arising from a combination of the hyperfine interaction and the coherent, spin-independent, PNC interaction from Z exchange is evaluated using many-body perturbation theory. For the 6s-7s transition in 133Cs, we obtain a result that is about 40% smaller than that found previously by Bouchiat and Piketty [Phys. Lett. B 269, 195 (1991)]. Applying this result to 133Cs, leads to an increase in the experimental value of nuclear anapole moment and exacerbates differences between constraints on PNC meson coupling constants obtained from the Cs anapole moment and those obtained from other nuclear parity violating experiments. Nuclear spin-dependent PNC dipole matrix elements, including contributions from the combined weak-hyperfine interaction, are also given for the 7s-8s transition in 211Fr and for transitions between ground-state hyperfine levels in K, Rb, Cs, Ba+, Au, Tl, Fr, and Ra+.Comment: Revtex4 preprint 19 pages 4 table

The first dozen years of the history of ITEP Theoretical Physics Laboratory

The theoretical investigations at ITEP in the years 1945-1958 are reviewed. There are exposed the most important theoretical results, obtained in the following branches of physics: 1) the theory of nuclear reactors on thermal neutrons; 2) the hydrogen bomb project ("Tube" in USSR and "Classical Super" in USA); 3) radiation theory; ~4) low temperature physics; 5) quantum electrodynamics and quantum field theories; 6) parity violation in weak interactions, the theory of $\beta$-decay and other weak processes; 7) strong interaction and nuclear physics. To the review are added the English translations of few papers, originally published in Russian, but unknown (or almost unknown) to Western readers.Comment: 55 pages, 5 fig

GABRIELA : a new detector array for gamma-ray and conversion electron spectroscopy of transfermium elements

With the aid of the Geant4 Monte Carlo simulation package a new detection system has been designed for the focal plane of the recoil separator VASSILISSA situated at the Flerov Laboratory of Nuclear Reactions, JINR, Dubna. GABRIELA (Gamma Alpha Beta Recoil Investigations with the Electromagnetic Analyser VASSILISSA) has been optimised to detect the arrival of reaction products and their subsequent radioactive decays involving the emission of alpha- and beta-particles, fission fragments, gamma- and X-rays, and conversion electrons. The new detector system is described and the results of the first commissioning experiments are presented.Comment: 24 pages, Submitted to NIM

Features of the mechanism of formation of morphology of aluminosilicate films on aluminum substrate

The features of the formation of morphology of thin aluminosilicate films obtained electrochemically on an aluminum substrate from aqueous solutions of sodium silicate and sodium hydroxide have been systematically studied by atomic force microscopy. The effect of stress on the shape and characteristic dimensions of the surface elements of aluminosilicate films is shown. Films synthesized at a lower voltage (8 V) are characterized by an amorphous surface consisting of globules whose size ranges from 500 nm to 2,5 microns, for samples obtained at a higher voltage (more than 16 V), parallelepipeds with linear dimensions of 150-250 nm act as are found to be structural elements. It is established that at the first stage of synthesis, the surface of the aluminum anode is etched, and the resulting cells act as pores in which the aluminosilicate phase is formed. An assumption is made about the formation of films along the path of autocatalytic nucleation and about a direct dependence of the rate of formation of the crystalline phase on the voltage at which the synthesis is carried out

Russian with English abstract [(New data on the crystal chemistry of manganese oxides.)]

Electron microdiffraction and energy-dispersive analytical techniques have been used to identify various types of asbolan minerals. In ores of the Liipovskoe and Tyulenova deposits, USSR, Co-Ni asbolan occurs as lamellar aggregates, with ordered Mn4+ and Co-Ni octahedral layers forming two sublattices; molecular H2O occurs between the Co-Ni layers. In Ni asbolan from the central Urals, octahedral Mn4+ and insular Ni layers are aligned along the c axis, the ordered distribution of Ni resulting in the a parameter (5.21 A) of the hexagonal Ni-sublattice being sq root 3 X that (2.83 A) of the Mn4+-sublattice. In Co asbolan from Zaalveld, Thuringia, Co3+ cations occur in tetrahedral coordination with ordered interlayering of Mn4+ octahedral and Co3+ tetrahedral layers. Crystal-chemical data on birnessite, buserite, akhtenskite and vernadite are presented. -R.A.H

Russian with English abstract [(New data on the crystal chemistry of manganese oxides.)]

Electron microdiffraction and energy-dispersive analytical techniques have been used to identify various types of asbolan minerals. In ores of the Liipovskoe and Tyulenova deposits, USSR, Co-Ni asbolan occurs as lamellar aggregates, with ordered Mn4+ and Co-Ni octahedral layers forming two sublattices; molecular H2O occurs between the Co-Ni layers. In Ni asbolan from the central Urals, octahedral Mn4+ and insular Ni layers are aligned along the c axis, the ordered distribution of Ni resulting in the a parameter (5.21 A) of the hexagonal Ni-sublattice being sq root 3 X that (2.83 A) of the Mn4+-sublattice. In Co asbolan from Zaalveld, Thuringia, Co3+ cations occur in tetrahedral coordination with ordered interlayering of Mn4+ octahedral and Co3+ tetrahedral layers. Crystal-chemical data on birnessite, buserite, akhtenskite and vernadite are presented. -R.A.H