Investigation of electron capture decay of $^{258}$Db and α decay of $^{258}$Rf

Abstract : Electron capture decay of 258Db was measured directly via delayed coincidences between K Xrays and/or conversion electrons (from the electron capture decay), and spontaneous fission or α decay of the daughter nuclide 258Rf. Delayed K X-rays were also measured in prompt coincidence with conversion electrons, showing that electron capture decay also populates excited levels in the daughter nucleus. Our data indicate electron capture decay from two states in 258Db, thus supporting the existence of two longlived states in 258Db with some seconds half-life already known from α-decay studies. The analysis of correlations between photons, conversion electrons and fission events resulted in a strong evidence for population of two isomeric states in 258Rf by the electron capture decay of 258Db, with half-lives of T1/2 = (15 ± 10) μs and T1/2 = (2.4+2.4−0.8) ms. A previously reported α branch of 258Rf was confirmed. However, we obtained a significantly lower branching ratio bα = (0.049±0.016). The technique is discussed as a possible new method for Z-identification of odd-odd superheavy nuclei.
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Submitted on : Monday, November 14, 2016 - 2:40:14 PM
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F.P. Heßberger, S. Antalic, D. Ackermann, B. Andel, M. Block, et al.. Investigation of electron capture decay of $^{258}$Db and α decay of $^{258}$Rf. European Physical Journal A, EDP Sciences, 2016, 52, pp.328. ⟨10.1140/epja/i2016-16328-2⟩. ⟨in2p3-01396448⟩

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