Fine structure in the α decay of 223U

Publication date: Available online 14 November 2019Source: Physics Letters BAuthor(s): 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. LiAbstractFine 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.

Source: Physics Letters B - November 16, 2019 Category: Physics Source Type: research