Effect of a chromium admixture on the electronic structure and ordering of Ni3Mn

The effects of a chromium admixture on certain properties of the electronic structure and on the ordering of Ni₃Mn have been studied by neutron diffraction and by measurement of the resistivity , the internal saturation induction B_S, and the absolute thermal emf S. Analysis of the experimental data implies a closed Fermi surface for the Ni₃(Mn, Cr) alloys with a low chromium concentration c but an open Fermi surface for high c.Translated from Izvestiya VUZ. Fizika, No. 2, pp. 44–51, February, 1970.     

Test of calculations on dislocation blocking in copperbase solid solutions

The creep threshold =f(c) for deformation aging under load is examined for Cu-Al, Cu-Ge, and Cu-Ni solid solutions; in each case it is in good general agreement with the theoretical relation for dislocation blocking. The data provide support for theoretical calculations on the main dislocation-blocking factors.     

Mechanics of deformation of structurally nonuniform media

It is shown theoretically and experimentally that the complete deformation of structurally nonuniform media consists of two components: macrodeformation, which is determined by the relative displacement of the elements in the structure (grains, subgrains, phases, and so on) as a whole, and microdeformations, which represent the deformations of these elements themselves.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 82–86, November, 1981.     

The formation of the superheavy hydrogen isotope <Superscript>6</Superscript>H in the absorption of stopped π<Superscript>−</Superscript>-mesons by nuclei

An experimental search for the superheavy hydrogen isotope ⁶H was conducted through studying the absorption of stopped π^?-mesons by ⁹Be and ¹¹B nuclei. A structure in the missing mass spectrum caused by the resonance states of ⁶H was observed in three reaction channels, namely, ⁹Be(π^?, pd)X, ¹¹B(π^?, d³He)X, and ¹¹B(π^?, p⁴He)X. The parameters of the lowest state E_r=6.6±0.7 MeV and Γ=5.5±2.0 MeV (E_r is the resonance energy with respect to the disintegration into the triton and three neutrons) are evidence that ⁶H is a more weakly bound system than ⁴H and ⁵H. Three excited states of ⁶H were observed. Their resonance levels (E_1r=10.7±0.7 MeV, Γ_1r=4±2 MeV, E_2r=15.3±0.7 MeV, Γ _2r=3±2 MeV, and E_3r=21.3±0.4 MeV, Γ_3r=3.5±1.0 MeV) are energetically capable of disintegrating into six free nucleons.     

A Conjugacy Theorem for Subgroups of SLn that Contain the Group of Diagonal Matrices

Let R be a commutative local ring. It is proved that if n 3 and the residue field of R contains at least 3n + 2 elements, then the subgroup of diagonal matrices in the special linear group of degree n over R is pronormal. For semilocal rings with the same restrictions on residue fields, this subgroup is paranormal. Bibliography: 13 titles.     

X-OH 2 + (X = C, O) cations: Vibrational spectra, stability, and electron capture reactions

Calculations of the potential energy surfaces of X-OH ₂ ⁺ cations (X = C, O) by the restricted and unrestricted Hartree-Fock methods (RHF, UHF) taking into account the correlation energy (MP-2) and by the CASSCF method are presented. All cations are found to be rather stable against X-O bond rupture and intermolecular rearrangement. The reaction of electron capture by these cations is studied.