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- A Yu Umnikov
- 1996

The structure functions b1,2(x) of the deuteron are studied within covariant approach. It is shown that usual nonrelativistic convolution model result in incorrect behavior of this structure functions at small x and violates the exact sum rules. Realistic calculations are carried out with the Bethe-Salpeter amplitude of the deuteron and compared with the… (More)

- A.S. Kurkov, O.I. Medvedkov, +6 authors N.I. Vechkanov
- OFC/IOOC . Technical Digest. Optical Fiber…
- 1999

Photosensitive at 244 nm double-clad Yb-doped germanosilicate fibers have been developed. Fiber lasers based on these fibers exhibited 65% differential efficiency and 100 mW threshold at both 910 and 980 pump wavelengths.

The nuclear effects in the spin-dependent structure function g1 of the deuteron are studied in the kinematics of future experiments at CEBAF, (ν ≤ 3 GeV, Q2 ≤ 2 GeV 2). The magnitude of the nuclear effects is found to be significantly larger than the one occurring in deep inelastic scattering (ν → ∞, Q2 → ∞). We discuss the mechanism leading to large… (More)

- F C Khanna, A Yu Umnikov
- 1996

In the present talk we discuss the spin-dependent structure functions (SF) of nuclei and their relation to those of nucleon. Our main focus will be the deuteron, which we study in detail in the covariant Bethe-Salpeter formalism. Why it so important and interesting to study the nuclear effects in the SFs? First, nuclei are the only source of the… (More)

- A.Yu. Umnikov
- 1996

The parametrization of the realistic Bethe-Salpeter amplitude for the deuteron is given. Eight components of the amplitude in the Euclidean space are presented as an analytical fit to the numerical solution of the Bethe-Salpeter equation in the ladder approximation. An applicability of the parametrization to the observables of the deuteron is briefly… (More)

- A Yu Umnikov, F C Khanna
- 1995

The problem of calculating of the mass spectrum of the two-body BetheSalpeter equation is studied with no reduction to the three-dimensional (”quasipotential”) equation. The method to find the ground state and excited states for a channel with any quantum numbers is presented. The problem of the confining interaction for the Bethe-Salpeter equation is… (More)

A theoretical approach to the investigation of spin-dependent structure functions in deep inelastic scattering of polarized leptons off polarized nuclei, based on the effective meson-nucleon theory and operator product expansion method, is proposed and applied to deuteron and 3He. The explicit forms of the moments of the deuteron and 3He spin-dependent… (More)

A covariant field theoretical approach to deep inelastic scattering on the deuteron is presented. The deuteron structure function is calculated in terms of the BetheSalpeter amplitude. Numerical calculations for the nucleon contribution are made with a realistic model of the NN -interaction, including π-, ρ-, ω-, η-, δand σ-mesons, and results are compared… (More)

Nuclear effects in the spin-dependent structure function g1 of the deuteron are studied in the kinematics of future experiments at CEBAF, (ν ≤ 3 GeV, Q2 ≤ 2 GeV 2). The magnitude of nuclear effects is found to be significantly larger than the one occurring in deep inelastic scattering (ν → ∞, Q2 → ∞). A possibility to measure the neutron structure functions… (More)

Nuclear effects in polarized inelastic electron scattering off polarized He and polarized H are discussed; in the resonance region, Fermi motion effects are found to be much larger than in deep inelastic scattering. It is shown that improperly describing nuclear dynamics would lead to the extraction of unreliable neutron spin structure functions; on the… (More)