Alexandrina Petrovici
(National Institute of Physics and Nuclear Engineering (IFIN-HH)-)
The investigation of shape coexistence phenomena dominating the structure of
A= 60 - 90 nuclei requires the framework of beyond mean-field approaches.
We use the {\it complex} Excited Vampir variational approach to describe
self-consistently the properties of proton-rich nuclei in this mass region.
We study dynamical aspects of exotic nuclear structure using realistic effective
interactions and rather large model spaces.
Large scale beyond mean-field calculations accounting the properties of experimentally
accessible nuclei allow to predict characteristics that are beyond the experimental
reach. Recent interesting results include the anomalous behaviour of Coulomb energy
differences (CED) for the mass A=70 compared with CED evolution for A$\simeq 80$ nuclei,
predictions concerning shape isomers and the influence of their Gamow-Teller $\beta$
decay on the half-life of the waiting point nuclei in the X-ray bursts environment,
and the importance of the model space within a self-consistent large scale calculation
of the Gamow-Teller strengths.
Summary
We present a self-consistent variational treatment of coexistence phenomena
dominating the structure and dynamics of proton rich nuclei in the A= 60-90
mass region within the {\it complex} Excited Vampir approach.
Shape coexistence and mixing, isospin mixing, competition between neutron-proton and
like-nucleon pairing correlations are responsible for exotic phenomena in medium mass
nuclei near the N=Z line. The self-consistent treatment of exotic structure and decay
dominated by their interplay is still an open problem.
Results include: Coulomb energy differences for pairs of analog nuclei with A=70, 82, 86
up to medium spins, predictions on the influence of possible shape isomers in
$^{68}$Se on the half-life in the X-ray bursts environment, discussion on the 'quenching'
issue within a beyond mean-field approach.
