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Fine structure in the alpha decay of $^{224}$U

Abstract : 224U nuclei were populated in fusion-evaporation reactions using a 206Pb target and an intense 22Ne beam. Fusion-evaporation residues were separated by the new separator SHELS at the FLNR, Dubna and implanted into a large-area double-sided silicon strip detector. Position- and time-correlated alpha decays were used to identify evaporation residues. A new α -decay line at 8095(11) keV was observed in this work and assigned as the decay from 224U to the first excited 2+ in the daughter nucleus 220Th. Coincident photons were also observed allowing to unambiguously determine the excitation energy of the first excited 2+ state in 220Th to be 386.5(1) keV and not 373.3(1)keV as previously reported. The half-life of 224U was measured to be 396(17)μs.
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Submitted on : Thursday, September 18, 2014 - 10:33:21 AM
Last modification on : Wednesday, September 16, 2020 - 5:43:04 PM

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A. Lopez-Martens, K. Hauschild, K. Rezynkina, O. Dorvaux, B. Gall, et al.. Fine structure in the alpha decay of $^{224}$U. European Physical Journal A, EDP Sciences, 2014, 50, pp.132-135. ⟨10.1140/epja/i2014-14132-8⟩. ⟨in2p3-01065465⟩

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