The problem of radial excitations of light mesons

Strong decays of the ground and radial-excited (L=0) states of light mesons are calculated within a relativistic (Lorentz-contraction-modified) version of the model of spontaneous production of aq \(\bar q\) -pair from vacuum.     

High-p T αα andαp interactions

Properties of secondaries associated with a high-p _T charged trigger particle (3<p _T <5 GeV/c) were studied for αp and αα interactions at c.m. energies \(\sqrt s = 88\) GeV and 125 GeV, respectively. Thep _T distributions of secondaries in the away-jet and trigger-jet regions were compared with those for high-p _{T pp} interactions. No statistically significant differences were seen, except at lowp _T . Momentum and angular distributions of spectator and leading protons were studied as a function of charge and rapidity of the trigger hadron. The observed correlations between trigger charge and number of spectator protons provide evidence of valence quark contributions to the trigger jet.     

Experimental investigation of population inversion of oxygen K-ion levels

Experimental results are reported of investigations of the optical properties of the plasma produced when an AI₂O₃ target is irradiated in vacuum by a high-power neodymiunr-glass laser system. It is shown that a number of 0 VIII and 0 VII ion levels with principal quantum numbers n = 2, 3, 4 are inversely populated. The gain at the wavelength 29 nm (4 3 transition, O VIII) under the experimental conditions is of the order of 0.01 cm^-1. For the heliumlike ions O VII, in a transition with the same principal quantum numbers (ls4p¹P₁ ls3s¹S₀, 36.9 nm), the gain is of the order of 10^-2–10^-1 cm^-1, depending on the electron density.Translated from Lazernye Sistemy, pp. 5–14 1982.     

Electric and tensoelectric study of radiation defects in GaAs

The electric and tensoelectric properties are studied for GaAs crystals which have been irradiated by electrons (2.3 Mev) at 300°K with integrated fluxes of up to 2·10¹⁵ –1·10¹⁹ cm^–2. On the basis of the electrical neutrality equation, including seven energy levels (E1–E5, H0, H1) of the radiation defects, the specific resistivity and the strain sensitivity coefficient are quantitatively analyzed as a function of exposure. The pressure coefficients for the E1–E5 levels with respect to the _c ⁶ point are determined to be (0, 9.6, 11.0, 11.6, 11.6)·10^–6 eV/bar, respectively, at 300°K.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 81–87, October, 1986.     

Geometrical connection between the equations of the special quasiclassical model of atomic systems

We study the geometrical connection between the fundamental equations of the quasiclassical model proposed by Rodimov to explain the behavior of microparticles in atomic systems in his monograph Self-Oscillating Quantum Mechanics; the v and u equations. It is shown that the geometry of the spaces for the v and u equations is different, but the metrical coefficients are related by simple algebraic relations.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii Fizika, No. 5, pp. 66–70, May, 1986.The author thanks Go I. Flesher for interest in the work and useful critical discussions and also I. L. Bukhbinder for fruitful discussions of the fundamental aspects of the work.     

Determinants and characteristic polynomials

The supersymmetric model in one dimension is used to calculate the fermion and scalar determinants in constant fields and express them in terms of the characteristic polynomials appearing in anomalies and index theorems. The operator determinants are transformed into those of a matrix.     

Parametric Excitation of the Electron-Acoustic Wave in a Multiply Ionized Plasma

Parametric excitation of the electron-acoustic wave (EAW) has been analysed using a hydrodynamical model. The plasma has been assumed to consist of multiply charged ions. The ratio (α) of the hotter ion concentration to that of the electrons is a sensitive parameter. The condition for the occurrence of the EAW is well satisfied for the smaller values of α. The growth rate of the instability gets enhanced by increasing α and the charge state of the hotter ions. The values of α can be varied within short range only.     

Use of the64Ni(36S,34,35Si)66,65Zn reactions to measure the masses of34Si and35Si

The ground-state masses of³⁵Si and³⁴Si have been measured using the reactions⁶⁴Ni(³⁶S,^35,34Si)^65,66Zn at a³⁶S beam energy of 198 MeV.^34,35Si¹⁴⁺ ions were analysed and identified in a QMG/2 magnetic spectrometer and gas-filled focal-plane detector. The experimental mass excess of³⁵Si was determined to be ?14.58± _0.12 ^0.07 MeV while that of³⁴Si was measured as ?19.961±0.034 MeV. A comparison is made with the results of mass model predictions.     

Domain-wall energy in sintered Nd15Fe77B8 permanent magnet

From measurements of the magnetic domain widthsD versus grain thicknessL, we have determined the domain wall energy in the demagnetized state for a sintered Nd₁₅Fe₇₇B₈ magnet: = 56 erg/cm². Using this wall energy and the published magnetocry-stalline constantK ₁=4.9×10⁷ erg/cm³, we have calculated the exchange constantA=4.0×10^–6 erg/cm, domain wall thickness _B=89 Å, and the critical diameter for single domain particlesD _c=0.67 m.