The evolution of the nucleon structure as a function of atomic mass A is considered for the first time for the lightest nuclei, D, 3H, 3He and 4He, with an approach based on the Bethe-Salpeter ...formalism. We show that the pattern of the oscillation of the structure functions ratio r^A(x) = F_2^A/F_2^N(D) varies with A by changing the position of the cross-over point x_3 in which r^A(x) = 1, unlike the pattern for nuclei with masses A larger than 4, where only the amplitude of the oscillation changes. In particular we find that the pattern of F_2(x) modifications is controlled with the values (1 - x_3) = 0.32 (D/N), 0.16 (3He/D) and 0.08 (4He/D). The obtained results follow from the relativistic consideration of the nuclear structure and allow us to define a whole class of modifications of the partonic distributions in the nucleon bound in a nucleus. The EMC effect is explained as a particular case of the considered class.
The evolution of the EMC effect as a function of atomic mass \(A\) is considered for the first time for the lightest nuclei, D, \(^3H\), \(^3He\) and \(^4He\), with an approach based on the ...Bethe-Salpeter formalism. We show that the pattern of the oscillation of the ratio \(r^A(x) = F_2^A/F_2^N(D)\) varies with \(A\), unlike the pattern for nuclei with masses \(A > 4\), where only the amplitude of the oscillation changes.
Recent developments of the covariant Bethe-Salpeter (BS) approach with the use of the separable interaction for the deuteron are reviewed. It is shown that the BS formalism allows a covariant ...description of various electromagnetic reactions like the lepton-deuteron scattering, deuteron electro-disintegration, deep inelastic scattering (DIS) of leptons on light nuclei. The procedure of the construction of the separable nucleon-nucleon (NN) interaction is discussed. The BS formalism facilitates analysis of the role of the P-waves (negative energy components) in the electromagnetic properties of the deuteron and its comparison with the nonrelativistic results. Furthermore the covariant BS approach makes it possible to analyze DIS of leptons from the deuteron in a model independent way and to extend the formalism to DIS reactions on the light nuclei.
The instrument complete set for cordless measurement of amplitude of impulse magnetic fields with an induction from 0,1 T up to 1,0 T, is considered. The set is designed on the basis of compact ...passive sensors of an impulse magnetic field. The offered method of multipoint measurement ensures a high spatial resolution and screening from effect of accompanying impulse electric fields.
Phys.Lett. B587 (2004) 175-183 The neutron structure function F2n(x) is evaluated within the kinematic range
10**(-3)<x<1 from the deuteron and proton data by employing relativistic
theoretical ...description of F2D(x) and several assumptions on the hihg-x
asymptotics of F2n(x)/F2p(x). It is shown that new measurements of F2D(x) in
the range 0.6<x<0.8 would substantially improve understanding of the relation
between d and u valence quarks in the limit x -> 1.
The neutron structure function F2n(x) is evaluated within the kinematic range 10**(-3)<x<1 from the deuteron and proton data by employing relativistic theoretical description of F2D(x) and several ...assumptions on the hihg-x asymptotics of F2n(x)/F2p(x). It is shown that new measurements of F2D(x) in the range 0.6<x<0.8 would substantially improve understanding of the relation between d and u valence quarks in the limit x -> 1.
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