Direct Evidence of Octupole Deformation in Neutron-Rich ^{144}Ba.

@article{Bucher2016DirectEO,
  title={Direct Evidence of Octupole Deformation in Neutron-Rich ^\{144\}Ba.},
  author={Brian M Bucher and S. Zhu and C. Y. Wu and R. V. F. Janssens and Doug Cline and A. B. Hayes and Michael Albers and A. D. Ayangeakaa and P. A. Butler and Christopher Campbell and M. P. Carpenter and C. J. Chiara and J A Clark and H. L. Crawford and Mario Cromaz and Helena May David and Clayton Dickerson and Eduard Gregor and J. Harker and Calem R. Hoffman and B. P. Kay and F. G. Kondev and Ahmed Korichi and T. Lauritsen and A. O. Macchiavelli and R. C. Pardo and A. L. Richard and Margaret A Riley and Guy Savard and M. Scheck and Dariusz Seweryniak and M. K. Smith and Richard Vondrasek and Andreas Wiens},
  journal={Physical review letters},
  year={2016},
  volume={116 11},
  pages={
          112503
        }
}
The neutron-rich nucleus ^{144}Ba (t_{1/2}=11.5  s) is expected to exhibit some of the strongest octupole correlations among nuclei with mass numbers A less than 200. Until now, indirect evidence for such strong correlations has been inferred from observations such as enhanced E1 transitions and interleaving positive- and negative-parity levels in the ground-state band. In this experiment, the octupole strength was measured directly by sub-barrier, multistep Coulomb excitation of a post… 
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TLDR
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