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Gaussian sum-rules, which are related to a two-parameter Gaussian-weighted integral of a hadronic spectral function, are able to examine the possibility that more than one resonance makes a significant contribution to the spectral function. The Gaussian sum-rules, including instanton effects, for scalar gluonic and non-strange scalar quark currents clearly indicate a distribution of the resonance strength in their respective spectral functions. Furthermore, analysis of a two narrow resonance model leads to excellent agreement between theory and phenomenology in both channels. The scalar quark and gluonic sum-rules are remarkably consistent in their prediction of masses of approximately 1 GeV and 1.4 GeV within this model. Such a similarity would be expected from hadronic states which are mixtures of gluonium and quark mesons. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

The 7Li total photoabsorption cross section is calculated microscopically, using the semi-realistic AV4’ as nucleon-nucleon potential. The interaction of the final 7-nucleon system is fully taken into account via the Lorentz Integral Transform (LIT) method. For the calculation of the LIT we use expansions in hyperspherical harmonics (HH) in conjunction with the effective interaction (EIHH) approach. The calculated cross section agrees quite well with the available experimental data in an energy range from threshold up to 100 MeV. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Focuses on the incorporation of a three-nucleon force in the effective interaction hyperspherical harmonic approach. Calculation of the ground state properties of the three-nucleon systems; Use of the AV18 nucleon-nucleon potential and the Urbana IX three-nucleon force in the calculation; Obtainment of a good convergence of binding energies and matter radii.

Investigates the modern nuclear force predictions for the total 4He photoabsorption cross-section. Use of the art NN force AV18 and NNN force UIX for the calculation; Application of the hyperspherical harmonics effective interaction method for the resulting equations; Presentation of the convergence of the LIT as a function of the hyperspherical quantum number K.

Investigates the application of the Lorentz Integral Transform method to electron scattering off 4He. Use of the Effective Interaction with the Hypersphetical Harmonics for the solution of the Schrödinger-like equation; Calculation of the transverse response function of 4He; Comparison of the results for the dominant one-body spin current with the experimental data.

Calculates the longitudinal response function of the exclusive process 4He(e,e' p)3H reaction. Use of the Lorentz Integral Transform method; Investigation of the reliability of the direct knock-out hypothesis and the role of final state interaction; Illustration of the effects of the "exchange terms."