Several proposals related to new parametrisations have been formulated.
They fall into the category of extensions and improvements of the
existing and rather well established microscopic methods. This will allow,
first of all, to made a progress in our understanding of the exotic nuclei
and various exotic multi-fermion configurations that such nuclei are expected
to produce.
In order to solve the first step (new and/or improved parametrisations of
the effective nuclear interactions) several standard calculations will needed
to be done. This will be a very important but rather tedious and work
consuming operation aiming principally at repetitive calculations of the
nuclear properties in the ground- and the low-lying excited states
by using the following algorithms/techniques:
The calculation will be performed on basis of the microscopic, both non-selfconsistent and self-consistent methods. We feel that an interesting and important progress in the fine tuning of the nuclear hamiltonians can be achieved by addressing in this context the experimental information about relatively less explored nuclear features:
The techniques and the computer codes necessary to study these
static properties
of nuclei at the state-of-the-art level have already been developed and are
at the disposal of the future participants. In particular variants of
the microscopic-macroscopic method basing on the most realistic macroscopic
models have already been advanced. The single particle
problem could be solved, depending on the particular context, with various
average field hamiltonians by
employing either the newest version of the Nilsson, the Woods-Saxon and/or
derived from Dirac equation hamiltonians. Of course it is not our intention
to repeat the same work with the alternative models. We will rather concentrate
the effort
on the optimizing one effective, realistic hamiltonian that could serve at the
same time to describe the single-nucleonic properties throughout the periodic
table including the exotic nuclei.
It is particularly worthwhile at present to revisit the Skyrme-type
parametrisation of the effective nuclear forces within the self-consistent
Hartree-Fock formalism. The new possibilities are related to the exploration
of the time-odd terms in the corresponding effective hamiltonian and the
verification of the proposed improvements by using the large high-spin data
bank available at present. These interesting new data have been obtained
during several years within various international collaboration projects
and more recently from the top level projects
such as EUROGAM or the US project GAMMASPHERE.
We intend to invest into
the improvements of the average field parametrisations of the Woods-Saxon
type potentials first. This will be done by taking into account all the
available data on the single particle binding energies, the relative order
of the (quasi-) particle levels, the root-mean-square radii, the
measured equilibrium deformations as well as the information available about
fission isomers. This first step will allow us to accumulate and critically
approach the existing experimental information. The choice of the Woods-Saxon
method has the advantage of being at the same time "realistic" and quick
from the numerical point of view.
Main ingredient of the almost all microscopic theories,
the usual effective interactions, must be reviewed
to be successful also near the neutron drip lines.
Some progress have been recently made within the zero-range Skyrme
interaction with new set of parameters obtained E. Chabanat and coworkers.
It is our intention to extend these efforts in order
to obtain the highest standard effective force that can be obtained nowadays
by using all empirical information available today (and totally unavailable
when some of those concepts have been introduced several years ago).
The Gogny and Skyrme effective interactions will be used to extract the shell effects in proton and neutron density distributions in nuclei and evaluate a new macroscopic formula for the nuclear energy.