SIMPLE-MODEL FOR SPIN-CRISIS

Starting from the additive quark SU(6) model and taking into account t he pion and kaon (eta) emission during the initial stage of evolution (from q(2) approximate to m(quark)(2) to q(2) similar to 1 GeV2) we co nvert the main fraction of the proton spin into the orbital momentum o f the pseudoscalar mesons. The results are in a good agreement with th e experimental data. We get integral g(1)(x)dx = 0.152 for proton and + 0.007 for the Lambda hyperon (i.e. the quarks carry out only about 3 9% of the Lambda spin). In the same model we explain the violation of the Gottfried sum rule - integral (F-2(p)(x) - F-2(n)(x)) dx = 0.23 du e tn thp charge meson exchanges at beginning of the evolution. The Gri bov-Lipatov relation between the polarized structure functions in DIS and e(+)e(-)-annihilation is discussed. It gives the possibility to st udy the spin structure of Lambda hyperon produced through the decay of the jet originated by a polarized quark in e(+)e(-)-annihilation or i n DIS.