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- A Yu Umnikov
- 1996

Relativistic Calculation of Structure Functions b 1,2 (x) of the Deuteron. Abstract The structure functions b D 1,2 (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… (More)

- Armann Ingolfsson, Md. Amanul Haque, Alex Umnikov
- European Journal of Operational Research
- 2002

- A Yu Umnikov, F C Khanna
- 1995

The problem of calculating of the mass spectrum of the two-body Bethe-Salpeter equation is studied with no reduction to the three-dimensional (" qua-sipotential ") 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.S. Kurkov, O.I. Medvedkov, V.I. Karpov, S.A. Vasiliev, O.A. Lexin, E.M. Dianov +3 others
- 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.

- S Scopetta, A Yu Umnikov, C Ciofi, Degli Atti, L P Kaptari
- 1997

Nuclear effects in polarized inelastic electron scattering off polarized 3 He and polarized 2 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)

- C Ciofi, Degli Atti, L P Kaptari, S Scopetta, A Yu Umnikov
- 1996

Nuclear effects in the spin-dependent structure function g 1 of the deuteron are studied in the kinematics of future experiments at CEBAF, (ν ≤ 3 GeV, Q 2 ≤ 2 GeV 2). The magnitude of nuclear effects is found to be significantly larger than the one occurring in deep inelastic scattering (ν → ∞, Q 2 → ∞). A possibility to measure the neutron structure… (More)

The nuclear effects in the spin-dependent structure function g 1 of the deuteron are studied in the kinematics of future experiments at CEBAF, (ν ≤ 3 GeV, Q 2 ≤ 2 GeV 2). The magnitude of the nuclear effects is found to be significantly larger than the one occurring in deep inelastic scattering (ν → ∞, Q 2 → ∞). We discuss the mechanism leading to large… (More)

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