Fine structure in the α decay of 223U

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, H.B. Yang, L. Ma, Z.Y. Zhang, L. Yu, Jian Jiang, K.L. Wang, Y.S. Wang, M.L. Liu, J. LiZ.H. 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

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Fine structure in the α decay of 223U was observed in the fusion-evaporation reaction 187Re(40Ar, p3n) by using fast digital pulse processing technique. Two α-decay branches of 223U feeding the ground state and 244 keV excited state of 219Th were identified by establishing the decay chain 223U →α1 219Th →α2 215Ra →α3 211Rn. The α-particle energy for the ground-state to ground-state transition of 223U was determined to be 8993(17) keV, 213 keV higher than the previous value, the half-life was updated to be 62−10+14 μs. 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 223U relative to its lighter isotones 219Ra and 221Th was suggested.
Original languageEnglish
Article number135096
Number of pages5
JournalPhysics Letters B
Early online date14 Nov 2019
Publication statusPublished - 20 Jan 2020

Bibliographical note

© 2019 The Author(s)


  • Fine structure
  • decay
  • Spin and parity
  • Reduced -decay width
  • Quadrupole-octupole deformation

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