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Fine structure in the $$alpha$$ decay of $$^{223}$$U

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, L. J.*; Zuo, W.*; Xu, H. S.*; Zhou, X. H.*; Xiao, G. Q.*; Qi, C.*; Zhang, F. S.*

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$$rightarrow$$$$^{219}$$Th$$rightarrow$$$$^{215}$$Ra$$rightarrow$$$$^{211}$$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 $$^{211}$$Th was suggested.

Language

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English

Journal

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Physics Letters B

Volume

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800

Number

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Pages

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p.135096_1 - 135096_5

Publication Year/Month

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2020/01

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Held date

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Patent information

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PDF

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Paper URL

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https://doi.org/10.1016/j.physletb.2019.135096

DOI for research data

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Keywords

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Fine Structure; ALPHA Decay; Quadrupole-octupole deformation

Research Facility

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Press Release

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Article of JAEA R&D Review

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Cooperating Institute

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Accesses

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- Accesses

InCites™

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Percentile:79.42

Category:Astronomy & Astrophysics

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