Abstract
The extremely neutron-deficient even-even uranium isotopes U216,218 were produced in the complete-fusion reactions induced by impinging Ar40 and Ca40 ions on W180,182,184 targets. Fusion evaporation residues were separated in flight by the gas-filled recoil separator SHANS (Spectrometer for Heavy Atoms and Nuclear Structure) and subsequently identified using the recoil-α-correlation method. The improved ground-state to ground-state α-decay properties of U216,218 were reported in [Z. Y. Zhang et al., Phys. Rev. Lett. 126, 152502 (2021)]. In this paper, we report on new α-decay activities with Eα=10163(27) keV for U216 and Eα=10073(16) keV for U218, which decay from the 8+ isomeric states of U216,218 into the 2+ states of their daughter nuclei Th212,214, respectively. The new results extend the systematics of the α-decay fine structure for the N=124 and 126 even-even isotones.Received 13 April 2022Revised 27 June 2022Accepted 26 July 2022DOI:https://doi.org/10.1103/PhysRevC.106.024305©2022 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasAlpha decayIsomer decaysNuclear structure & decaysRare & new isotopesProperties190 ≤ A ≤ 219TechniquesSpectrometers & spectroscopic techniquesNuclear Physics
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