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 $^{219}$Th $^{215}$Ra $^{211}$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 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 $^{223}$U relative to its lighter isotones $^{219}$Ra and $^{221}$Th was suggested.
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"value": "Fine structure in the \u03b1 decay of $^{223}$U was observed in the fusion-evaporation reaction $^{187}$Re($^{40}$Ar, p3n) by using fast digital pulse processing technique. Two \u03b1-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 <math><mover><mrow><mo>\u2192</mo></mrow><mrow><msub><mrow><mi>\u03b1</mi></mrow><mrow><mn>1</mn></mrow></msub></mrow></mover></math> $^{219}$Th <math><mover><mrow><mo>\u2192</mo></mrow><mrow><msub><mrow><mi>\u03b1</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></mover></math> $^{215}$Ra <math><mover><mrow><mo>\u2192</mo></mrow><mrow><msub><mrow><mi>\u03b1</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></mover></math> $^{211}$Rn. The \u03b1-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<math><msubsup><mrow></mrow><mrow><mo>\u2212</mo><mn>10</mn></mrow><mrow><mo>+</mo><mn>14</mn></mrow></msubsup></math> \u03bcs. Evolution of nuclear structure for N = 131 even-Z isotones from Po to U was discussed in the frameworks of nuclear mass and reduced \u03b1-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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