It is shown that the specific space distribution of the nucleon axial charge may lead to the significant reduction of the cross section of the reaction p + p → D + e + ν and may provide the mechanism to explain observed deficit of solar neutrinos. The deficit of solar neutrinos is one of the longstanding unsolved problem in astrophysics (see review [1]). The reaction p + p → D + e + ν is most i...

We analyze nuclear effects in the deep inelastic scattering on deuteron in the framework of the covariant approach. It is shown that this approach gives us the way to investigate the role of relativistic effects in the deep inelastic scattering (DIS) on deuteron, such as the relativistic kinematics and the off-mass-shell behavior of the Compton amplitude of nucleon in the consistent manner. We ...

A superconducting solenoid for WASA. General project description and status (February 91) Abstract A thin walled superconducting warm bore solenoid with a central magnetic eld of 1.5 Tesla is being designed for the WASA 4 detector for particle physics experiments at the CELSIUS ring. The overall length of the solenoid is 550 mm, its inner and outer diameter are 490 mm and 650 mm respectively. T...

Collisions between hadronic systems at relativistic energies provide a window on the small-x gluon distributions of fast moving nuclei. It has been predicted that gluon saturation effects will manifest themselves as a suppression in the transverse momentum (p t) distribution at a scale which is connected with the rapidity of the measured particles. Saturation effects are most evident at large (...

We analyse the proton and deutron data on spin dependent asymmetry A 1 (x, Q 2) supposing the DIS structure functions g 1 (x, Q 2) and F 3 (x, Q 2) have the similar Q 2-dependence. As a result, we have obtained Γ p 1 − Γ n 1 = 0.192 at Q 2 = 10 GeV 2 and Γ p 1 − Γ n 1 = 0.165 at Q 2 = 3 GeV 2 , in the best agreement with the Bjorken sum rule predictions. An experimental study of the nucleon spi...

In connection with the semi-inclusive polarized DIS, it is proposed to consider the first Melin moments ∆q of the polarized quark and antiquark densities, instead of the respective variables δq(x), local in Bjorken x themselves. This gives rise to a very essential simplification of the next to leading order (NLO) QCD and, besides, allows one to use the respective QCD sum rules. An expression fo...

In connection with the semi-inclusive polarized DIS, it is proposed to consider the first Melin moments ∆q of the polarized quark and antiquark densities, instead of the respective variables δq(x), local in Bjorken x themselves. This gives rise to a very essential simplification of the next to leading order (NLO) QCD and, besides, allows one to use the respective QCD sum rules. An expression fo...

In connection with the semi-inclusive polarized DIS, it is proposed to consider the first Melin moments ∆q of the polarized quark and antiquark densities, instead of the respective variables δq(x), local in Bjorken x themselves. This gives rise to a very essential simplification of the next to leading order (NLO) QCD and, besides, allows one to use the respective QCD sum rules. An expression fo...