Isoscalar monopole resonance of the alpha particle: a prism to nuclear Hamiltonians.

We present an ab initio study of the isoscalar monopole excitations of (4)He using different realistic nuclear interactions, including modern effective field theory potentials. In particular we concentrate on the transition form factor F(M) to the narrow 0(+) resonance close to threshold. F(M) exhibits a strong potential model dependence, and can serve as a kind of prism to distinguish among different nuclear force models.

Role of the final-state interaction and three-body force on the longitudinal response function of 4He.

We present an ab initio calculation of the longitudinal electron scattering response function off 4He with two- and three-nucleon forces and compare to experimental data. The full four-body continuum dynamics is considered via the Lorentz integral transform method. The importance of the final-state interaction is shown at various energies and momentum transfers q.

Photoabsorption on 4He with a realistic nuclear force.

The 4He total photoabsorption cross section is calculated with the realistic nucleon-nucleon potential Argonne V18 and the three-nucleon force (3NF) Urbana IX. Final state interaction is included rigorously via the Lorentz integral transform method. A rather pronounced giant resonance with peak cross sections of 3.

Microscopic calculation of six-body inelastic reactions with complete final state interaction: photoabsorption of (6)He and (6)Li.

Six-body inelastic reactions are calculated microscopically including the full six-nucleon final state interaction. The total cross sections of gamma+ (6)He ( (6)Li)-->X are considered as examples. The Lorentz integral transform method and the effective interaction approach for the hyperspherical formalism are employed.