Abstract
Mean lifetimes of yrast states of the isotopes have been measured using fast-electronic scintillation timing. Excited states of were populated via decay, while was populated via Coulomb excitation. The lifetimes of the and states of all isotopes and the lifetimes of the states of were measured, using the slope and the centroid shift methods. The mean lifetime, , of has been determined for the first time. In addition, the mean lifetimes of the and the states of have been determined. Systematic uncertainties on the evolution of data as a function of neutron number were reduced by using the same setup for all the isotopes of interest. The data are in agreement with other recent lifetime measurements where available and shows a shift of the maximum of collectivity for the Hf isotopic chain from neutron midshell at to .
3 More- Received 15 November 2018
- Revised 15 January 2019
DOI:https://doi.org/10.1103/PhysRevC.99.024316
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