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27 April 2024

» arxiv » 2109.04808

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$^{145}$Ba and $^{145, 146}$La structure from lifetime measurements
B. Olaizola ; A. Babu ; R. Umashankar ; A. B. Garnsworthy ; G. C. Ball ; V. Bildstein ; M. Bowry ; C. Burbadge ; R. Cabellero-Folch ; I. Dillmann ; A. Diaz-Varela ; R. Dunlop ; A. Estradé ; P. E. Garrett ; G. Hackman ; A. D. MacLean ; J. Measures ; C. J. Pearson ; B. Shaw ; D. Southall ; C. E. Svensson ; J. Turko ; K. Whitmore ; T. Zidar ;
Date:	10 Sep 2021
Abstract:	The occurrence of octupole shapes in even-mass neutron-rich Ba isotopes has been well established. However, the situation with the odd-mass Ba and odd or odd-odd La nuclei around them is far from settled. In order to shed light on these less-studied isotopes, a fast-timing experiment was performed using GRIFFIN at TRIUMF-ISAC. A wealth of excited-state lifetimes in the 100~ps to few ns range have been measured in $^{144, 145, 146}$Ba and $^{145,146}$La populated in the $eta^-$ and $eta^--n$ decay of $^{145,146}$Cs. The results do not allow to draw firm conclusions on the possible octupole deformation of these nuclei but suggest different spin and parity assignments than previous works. This work highlights the need for more detailed study of the odd and odd-odd isotopes in this region to properly understand their structure.
Source:	arXiv, 2109.04808
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