1 - IAEA Nuclear Data Services

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corresponding errors by non-linear least squares fitting.
Doublets are handled automatically. t ;
3.1. Theoretical studies on the nuclear wave functions
3.2. Excited levels of odd-odd deformed nuclei
During this year we have concentrated on the study of the
effects of a tensor component in the neutron-proton residual
interaction.
By fitting a large body of experimental data we have been able
to show that such a component exists and has important effects
on the energy levels of these nuclei.
A report of our results will soon be submitted for publication,
together with some calculations in which we apply our new
residual interaction to the investigation of the level schemes
of some nuclei which have received extensive experimental
attention C 166 Ho, 1V °Im, 182 Ta).
3.3. Generalized Hartree-Fock equations
Our investigation of the technique suggested by M. Jean for
the study of the nuclear many-body problem has led us to the
formulation of an equation which is equivalent to the usual
Hartree-Fock equations, but contains an additional term,
representing both second order effects and rearrangement
effects. A perturbation expansion of this term can lead to
the determination of an improved single-particle basis.
We are now performing a systematical analysis of the various
ways of solving this equation.
3.4. Study of intrinsic motion wave functions in shell-model
calculations
The nuclear hamiltonian has been substituted with one equivalent
with regard to the intrinsic motion of the nucléons, that is
the motion of the nucléons in their center of mass. The new