Speaker
Andreas Goergen
(DAPNIA/SPhN, CEA Saclay)
Description
Shape-coexisting states in neutron-deficient krypton isotopes
have been studied by low-energy multi-step Coulomb excitation
of radioactive 74Kr and 76Kr beams at GANIL. States up to the
8+ in the ground-state band and several non-yrast states have
been populated, and their excitation probability was measured
as a function of the scattering angle. A large set of both
transitional and diagonal matrix elements was obtained in the
analysis using the code GOSIA. The spectroscopic quadrupole
moments for the first and second 2+ states have opposite signs,
confirming the scenario of coexisting prolate and oblate shapes.
The results from the GANIL experiments will be discussed with
a special emphasis on the experimental techniques and difficulties
of reorientation measurements with low-intensity radioactive
beams. Ideas for future experiments to investigate shape
coexistence in neutron-rich nuclei around N=60 at ISOLDE using
the same techniques will be presented.
Author
Andreas Goergen
(DAPNIA/SPhN, CEA Saclay)
