Abstract

The coexistence of prolate and oblate shapes in light selenium and krypton isotopes has been investigated using the complementary techniques of low‐energy Coulomb excitation with radioactive ions beams and lifetime measurements of excited states after fusion‐evaporation reactions. The resulting B(E2) values and spectroscopic quadrupole moments represent a sensitive test for configuration mixing calculations going beyond the mean‐field approach. The onset of collectivity for neutron‐rich nuclei near 68Ni has been investigated using a new technique to measure lifetimes with the recoil distance Doppler shift method after multi‐nucleon transfer reactions.

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