Sensitivity of the Isoscalar Giant Dipole Resonance to Optical Potentials

The Influence of The Optical Potential Parameters on the Isoscalar Giant Dipole Resonance

The main experimental tool for studying isoscalar giant resonances is inelastic ∀-particle scattering, as this type of reaction is selective as to exciting isoscalar modes by either eliminating or greatly reducing the interference of other excitations. The angular distributions of inelastic scattered ∀-particles at small angles are characteristic for some of the multipolar modes in the experime...

The isoscalar giant dipole resonance: Where we stand?

The current status of the isoscalar giant dipole resonance (ISGDR) is reviewed. Over the past few years, experiments done with small-angle alpha scattering have provided the best evidence yet for this resonance and the experimental ISGDR strength distributions are reasonably well established in a number of nuclei. The implications of the experimental observations on the determination of the nuc...

Polarization associated with the coupling to isoscalar dipole compression mode

The effect of core polarization on isoscalar dipole one-particle moments due to the coupling with isoscalar giant dipole resonance ~compression mode! is estimated. Numerical calculations with the core nucleus 82 Pb126 show that a small enhancement of one-particle moments is obtained, of which the magnitude depends sensitively on relevant one-particle orbitals. The results are important for a mi...

EVIDENCE FOR THE ISOSCALAR GIANT DIPOLE RESONANCE IN 208Pb

0 On dipole compression modes in nuclei

Isoscalar dipole strength distributions in spherical medium-and heavy-mass nuclei are calculated within random phase approximation (RPA) or quasiparticle RPA. Different Skyrme-type interactions corresponding to incompressibilities in the range 200-250 MeV are used. The results are discussed in comparison with existing data on isoscalar giant dipole resonances. Two main issues are raised, firstl...