Abstract
Lifetimes of excited states in , and were measured in an experiment using the recoil distance Doppler shift method at GANIL (Grand Accélérateur National d'Ions Lourds). The neutron-rich nuclei were produced in fission reactions between a beam and a target. Prompt rays were measured with the EXOGAM array and correlated with fission fragments that were identified in mass and atomic number with the VAMOS++ spectrometer. The measured lifetimes, together with branching ratios, provide and values for the strongly coupled rotational bands built on the ground state in the Y and Nb nuclei with neutron number . The comparison of the experimental results with triaxial particle-rotor calculations provides information about the evolution of the nuclear shape in this mass region.
9 More- Received 19 November 2016
DOI:https://doi.org/10.1103/PhysRevC.95.034302
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