Direct Evidence for Octupole Deformation in $^{146}$Ba and the Origin of Large $E1$ Moment Variations in Reflection-Asymmetric Nuclei

Brian Bucher; Shaofei Zhu; Ching-Yen Wu; Robert Janssens; Remi Bernard; Luis Robledo; Tomas Rodriguez; Doug Cline; Adam Hayes; Akaa Ayangeakaa; Matt Buckner; Chris Campbell; Mike Carpenter; Jason Clark; Heather Crawford; Helena David; Clayton Dickerson; Jessica Harker; Calem Hoffman; Ben Kay; Filip Kondev; Torben Lauritsen; Augusto Macchiavelli; Richard Pardo; Guy Savard; Darek Seweryniak; Richard Vondrasek

doi:10.1103/physrevlett.118.152504

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arXiv · 1703.05268

Direct Evidence for Octupole Deformation in $^{146}$Ba and the Origin of Large $E1$ Moment Variations in Reflection-Asymmetric Nuclei

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Abstract

Despite the more than one order of magnitude difference between the measured dipole moments in $^{144}$Ba and $^{146}$Ba, the strength of the octupole correlations in $^{146}$Ba are found to be as strong as those in $^{144}$Ba with a similarly large value of $B(E3;3^- \rightarrow 0^+)$ determined as 48($^{+21}_{-29}$) W.u. The new results not only establish unambiguously the presence of a region of octupole deformation centered on these neutron-rich Ba isotopes, but also manifest the dependence of the electric dipole moments on the occupancy of different neutron orbitals in nuclei with enhanced octupole strength, as revealed by fully microscopic calculations.

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Brian Bucher, Shaofei Zhu, Ching-Yen Wu, Robert Janssens, Remi Bernard, Luis Robledo, Tomas Rodriguez, Doug Cline, Adam Hayes, Akaa Ayangeakaa, Matt Buckner, Chris Campbell, Mike Carpenter, Jason Clark, Heather Crawford, Helena David, Clayton Dickerson, Jessica Harker, Calem Hoffman, Ben Kay, Filip Kondev, Torben Lauritsen, Augusto Macchiavelli, Richard Pardo, Guy Savard, Darek Seweryniak, Richard Vondrasek. 2017-03-15. Direct Evidence for Octupole Deformation in $^{146}$Ba and the Origin of Large $E1$ Moment Variations in Reflection-Asymmetric Nuclei. https://doi.org/10.1103/physrevlett.118.152504

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