arXiv · 1904.04961
Fine structure in the $α$ decay of $^{223}$U
Abstract
Fine structure in the $α$ decay of $^{223}$U was observed in the fusion-evaporation reaction $^{187}$Re($^{40}$Ar, p3n) by using fast digital pulse processing technique. Two $α$-decay branches of $^{223}$U feeding the ground state and 244 keV excited state of $^{219}$Th were identified by establishing the decay chain $^{223}$U $\xrightarrow{α_{1}}$ $^{219}$Th $\xrightarrow{α_{2}}$ $^{215}$Ra $\xrightarrow{α_{3}}$ $^{211}$Rn. The $α$-particle energy for the ground-state to ground-state transition of $^{223}$U was determined to be 8993(17) keV, 213 keV higher than the previous value, the half-life was updated to be 62$^{+14}_{-10}$ $μ$s. Evolution of nuclear structure for $N$ = 131 even-$Z$ isotones from Po to U was discussed in the frameworks of nuclear mass and reduced $α$-decay width, a weakening octupole deformation in the ground state of $^{223}$U relative to its lighter isotones $^{219}$Ra and $^{221}$Th was suggested.
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M. D. Sun, Z. Liu, T. H. Huang, W. Q. Zhang, A. N. Andreyev, B. Ding, J. G. Wang, X. Y. Liu, H. Y. Lu, D. S. Hou, Z. G. Gan, L. Ma, H. B. Yang, Z. Y. Zhang, L. Yu, J. Jiang, K. L. Wang, Y. S. Wang, M. L. Liu, Z. H. Li, J. Li, X. Wang, A. H. Feng, C. J. Lin, L. J. Sun, N. R. Ma, W. Zuo, H. S. Xu, X. H. Zhou, G. Q. Xiao, C. Qi, F. S. Zhang. 2019-10-22. Fine structure in the $α$ decay of $^{223}$U. https://doi.org/10.1016/j.physletb.2019.135096
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