Direct Evidence of Octupole Deformation in Neutron-Rich Ba-144

Abstract : The neutron-rich nucleus Ba-144 (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-accelerated 650-MeV Ba-144 beam on a 1.0-mg/cm(2) Pb-208 target. The measured value of the matrix element, < 3(1)(-)parallel to M(E3)parallel to 0(1)(+)> = 0.65((+17)(-23)) eb(3/2,) corresponds to a reduced Bd(E3) transition probability of 48((+25)(-34)) W.u. This result represents an unambiguous determination of the octupole collectivity, is larger than any available theoretical prediction, and is consistent with octupole deformation.
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Submitted on : Monday, April 18, 2016 - 11:27:48 AM
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B. Bucher, S. Zhu, Y. Wu C., F. Janssens R. V., D. Cline, et al.. Direct Evidence of Octupole Deformation in Neutron-Rich Ba-144. Physical Review Letters, American Physical Society, 2016, 116 (issue 11), pp.112503. ⟨10.1103/PhysRevLett.116.112503⟩. ⟨in2p3-01303476⟩

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