학술논문
Fine structure in the $\alpha$ decay of $^{223}$U
Document Type
Working Paper
Author
Sun, M. D.; Liu, Z.; Huang, T. H.; Zhang, W. Q.; Andreyev, A. N.; Ding, B.; Wang, J. G.; Liu, X. Y.; Lu, H. Y.; Hou, D. S.; Gan, Z. G.; Ma, L.; Yang, H. B.; Zhang, Z. Y.; Yu, L.; Jiang, J.; Wang, K. L.; Wang, Y. S.; Liu, M. L.; Li, Z. H.; Li, J.; Wang, X.; Feng, A. H.; Lin, C. J.; Sun, L. J.; Ma, N. R.; Zuo, W.; Xu, H. S.; Zhou, X. H.; Xiao, G. Q.; Qi, C.; Zhang, F. S.
Source
PhysicsLettersB800(2020)135096
Subject
Language
Abstract
Fine structure in the $\alpha$ decay of $^{223}$U was observed in the fusion-evaporation reaction $^{187}$Re($^{40}$Ar, p3n) by using fast digital pulse processing technique. Two $\alpha$-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 $\xrightarrow{\alpha_{1}}$ $^{219}$Th $\xrightarrow{\alpha_{2}}$ $^{215}$Ra $\xrightarrow{\alpha_{3}}$ $^{211}$Rn. The $\alpha$-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$^{+14}_{-10}$ $\mu$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 $\alpha$-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.
Comment: 6 pages, 6 figures
Comment: 6 pages, 6 figures