QUANTUM-STATISTICAL PARTON DISTRIBUTIONS AND THE SPIN CRISIS

Quantum statistical distributions for partons provide a fair descripti on of deep inelastic scattering data at Q(2)=3 and 10 (GeV/c)(2). Stud y of the polarized structure functions seems to suggest an alternative possible solution of the spin crisis based on the Pauli principle. In this scheme, in fact, it becomes apparent that the defects of the Got tfried sum rule and Ellis-Jaffe sum rule for the proton are strongly c onnected. This possibility finds particular evidence from the phenomen ological observation that the relation Delta u=2 (F) over tilde+u-d-1 seems to be satisfied well by parton distributions.