Effects of Short Range Correlations on Ca Isotopes

The effect of Short Range Correlations (SRC) on Ca isotopes is studied using a simple phenomenological model. Theoretical expressions for the charge (proton) form factors, densities and moments of Ca nuclei are derived. The role of SRC in reproducing the empirical data for the charge density differences is examined. Their influence on the depletion of the nuclear Fermi surface is studied and the fractional occupation probabilities of the shell model orbits of Ca nuclei are calculated. The variation of SRC as function of the mass number is also discussed.Comment: 11 pages (RevTex), 6 Postscript figures available upon request at [email protected] Physical Review C in prin

Δ(1232)\Delta(1232) Isobar Excitations and the Ground State of Nuclei

The influence of $\Delta$ isobar components on the ground state properties of nuclear systems is investigated for nuclear matter as well as finite nuclei. Many-body wave functions, including isobar configurations, and binding energies are evaluated employing the framework of the coupled-cluster theory. It is demonstrated that the effect of isobar configurations depends in a rather sensitive way on the model used for the baryon-baryon interaction. As examples for realistic baryon-baryon interactions with explicit inclusion of isobar channels we use the local ($V28$) and non-local meson exchange potentials (Bonn$_{2000}$) but also a model recently developed by the Salamanca group, which is based on a quark picture. The differences obtained for the nuclear observables are related to the treatment of the interaction, the $\pi$-exchange contributions in particular, at high momentum transfers.Comment: 12 pages, including 5 figure

Systematics of radii and nuclear charge distributions induced from elastic electron scattering, muonic x-ray, and optical isotope-shift measurements

The nuclear charge distribution and nuclear charge distribution differences have been investigated by 350 MeV elastic electron scattering at the Institut fuer Kernphysik, Universitaet Mainz. Muonix x-ray measurements yield complementary information to electron scattering results. Both experimental data are analyzed in an almost model independent way. Muonic x-ray measurements have been performed for the region /sup 40/Ca up to /sup 100/Mo. Muonic x-ray transition energies allow the determination of one radial parameter R/sub k/ - the Barrett radius - with high precision. This Barrett radius combined with the charge distribution from elastic electron scattering yields the following precise radial parameters /sup 1/2/, /sup 1/4/ and /sup 1/6/. With the abolute values of these radial moments, it is possible to determine the two optical constants: the electron density at the nucleus and the specific mass shift