ISF 3.P142

The figures illustrate our present knowledge of even-N tin (top) and zirconium (bottom) isotopes together with the region
of interest for the r-process. Observed energy levels for even-even nuclei are shown with the first excited states being 2+.
The relatively high 2+ energies at N = 50 and N = 56 for zirconium and N = 82 for tin are indications of the shell gaps at
these magic numbers. Measured two-nucleon separation energies are indicated as red circles with two-proton separation
energies extending up from the proton dripline on the left and the two-neutron separation energies going down to the
neutron dripline on the right. The two-nucleon separation energies predicted by three different Skyrme interaction models
[Dob04,Gor06] and the Finite-Range Droplet Model (FRDM) [Mol95] are shown by the lines. The source of the deviation
for Sly4 from experiment near the magic numbers is partly understood and might be corrected by including groundstate
correlations. For the regions of interest in the r-process, the predictions show divergences related to uncertainties in
shape transitions and pairing energies that can be confronted by comparison to new experimental data from the ISF.

References:
[Gor06] S. Goriely et al., Nucl. Phys. A 773, 279 (2006)
[Mol95] P. Moller et al., At. Data Nucl. Data Tables 59, 185 (1995)