Octupole deformation in neutron-rich barium isotopes

Partial decay schemes for the very neutron-rich nuclei $^{142}$,144Ba and $^{146}\mathrm{Ba}$ have been determined by the study of \ensuremath{\gamma}-\ensuremath{\gamma} coincidences in $^{252}\mathrm{Cf}$ fission fragments. Interlaced positive- and negative-parity levels connected by fast electric dipole transitions are observed in $^{144}\mathrm{Ba}$ and $^{146}\mathrm{Ba}$ above spin 7\ensuremath{\Elzxh}. This is similar to the situation in some light actinide nuclei, where the data have been interpreted in terms of reflection-asymmetric shapes.

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