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Volume 281 - The 26th International Nuclear Physics Conference (INPC2016) - Nuclear Structure B – Friday 16
First Direct Observation Of Enhanced Octupole Collectivity In 144,146Ba
B. Bucher,* S. Zhu, C.Y. Wu, R.V.F. Janssens, D. Cline, A. Hayes, A. Ayangeakaa, M. Buckner, C. Campbell, M. Carpenter, J.A. Clark, H.L. Crawford, H. David, C. Dickerson, J. Harker, C. Hoffman, B. Kay, F. Kondev, T. Lauritsen, A. Macchiavelli, R. Pardo, G. Savard, D. Seweryniak, R. Vondrasek
*corresponding author
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Pre-published on: 2017 May 04
Published on: 2017 May 09
Abstract
The octupole strength present in the neutron-rich, radiocative nucleus $^{146}$Ba has been experimentally determined for the first time using Coulomb excitation. To achieve this, $A$=146 fission fragments from CARIBU were post-accelerated by the Argonne Tandem Linac Accelerator System (ATLAS) and impinged on a thin $^{208}$Pb target. Using the GRETINA $\gamma$-ray spectrometer and the CHICO2 heavy-ion counter, the reduced transition probability $B(E3;3^-$$\rightarrow$$0^+)$ was determined as 48($^{+21}_{-29}$) W.u. The new result provides further experimental evidence for the presence of a region of octupole deformation surrounding the neutron-rich barium isotopes.
DOI: https://doi.org/10.22323/1.281.0077
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