No abstract

The interaction of Nucleon-Nucleon (N N ) has certain physical characteristics, which indicated by nucleon, and meson degrees of freedom. The main purpose of this work is calculating the ground state energies of 2 1 H and 4 2 He through the two-body system with the exchange of mesons (π, σ, ω) that mediated between two nucleons. This paper investigates NN interaction based on the quasirelativistic decoupled Dirac equation and self-consistent Hartree-Fock formulation. We construct one-boson exchange potential (OBEP) model, where each nucleon is treated as a Dirac particle and acts as a source of pseudoscalar, scalar, and vector fields. The potential in the present work is analytically derived with two static functions of meson, the single particle energy dependent(SPED) and generalized Yukawa (GY) functions, the parameters used in meson functions are just published ones (mass, coupling constant,and cut off parameters). The theoretical results are compared to other theoretical models and their corresponding experimental data, one can see that the SPED function gives more satisfied agreement than the GY function in case of the considered nuclei.

The possibility of observing a bright interior in the nucleus ''viewed'' by intermediate energy alpha particles (E ␣ ϭ172.5 MeV͒, as a probe for the 58 Ni nucleus, previously predicted by applying only a first-order noneikonal correction and one simple optical model potential was confirmed. The first-, second-, and third-order noneikonal corrections to the Glauber model were incorporated in three arbitrary different nominal optical potentials and the effects of switching ͑off/on͒ the Coulomb potential were studied. The role of corrections in the effective potentials and also the results of calculations of the imaginary part of the phase shift functions for the different optical potentials used were discussed. ͓S0556-2813͑97͒01107-2͔

Nuclear quark distribution functions, obtained in the framework of the multiquark cluster model, show that the EMC effect can be explained by taking into account the scattering on colourless multiquark configurations in nuclei. The prediction for the behaviour of the nuclear structure function in the kinematical region X > 1, which has not been sufficiently studied experimentally, is given. The Drell-Yan cross sections for lepton pair production in proton-platinum at 400GeVc" and pion-tungsten at pion energy 280GeV interactions were calculated in addition to the prediction of the behaviour of crawsection ratios in different kinematical regions. The predictions show significant nuclear effects in these processes.