Abstract
A nuclear spectroscopy experiment was conducted to study α-decay chains stemming from isotopes of flerovium (element Z=114). An upgraded TASISpec decay station was placed behind the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany. The fusion-evaporation reactions ^{48}Ca+^{242}Pu and ^{48}Ca+^{244}Pu provided a total of 32 flerovium-candidate decay chains, of which two and eleven were firmly assigned to ^{286}Fl and ^{288}Fl, respectively. A prompt coincidence between a 9.60(1)-MeV α particle event and a 0.36(1)-MeV conversion electron marked the first observation of an excited state in an even-even isotope of the heaviest man-made elements, namely ^{282}Cn. Spectroscopy of ^{288}Fl decay chains fixed Q_{α}=10.06(1) MeV. In one case, a Q_{α}=9.46(1)-MeV decay from ^{284}Cn into ^{280}Ds was observed, with ^{280}Ds fissioning after only 518 μs. The impact of these findings, aggregated with existing data on decay chains of ^{286,288}Fl, on the size of an anticipated shell gap at proton number Z=114 is discussed in light of predictions from two beyond-mean-field calculations, which take into account triaxial deformation.
Highlights
A nuclear spectroscopy experiment was conducted to study α-decay chains stemming from isotopes of flerovium
A Qα 1⁄4 9.46ð1Þ-MeV decay from 284Cn into 280Ds was observed, with 280Ds fissioning after only 518 μs. The impact of these findings, aggregated with existing data on decay chains of 286;288Fl, on the size of an anticipated shell gap at proton number Z 1⁄4 114 is discussed in light of predictions from two beyond-mean-field calculations, which take into account triaxial deformation
In the case of Mc, primarily the decay chain associated with 288Mc was subject to nuclear spectroscopy studies [10,11]
Summary
Spectroscopy along Flerovium Decay Chains: Discovery of 280Ds and an Excited State in 282Cn. A. A nuclear spectroscopy experiment was conducted to study α-decay chains stemming from isotopes of flerovium (element Z 1⁄4 114). A prompt coincidence between a 9.60(1)-MeV α particle event and a 0.36(1)-MeV conversion electron marked the first observation of an excited state in an even-even isotope of the heaviest man-made elements, namely 282Cn. Spectroscopy of 288Fl decay chains fixed Qα 1⁄4 10.06ð1Þ MeV. In the case of Mc, primarily the decay chain associated with 288Mc was subject to nuclear spectroscopy studies [10,11]. Supported by Monte Carlo simulations [12], decay schemes based on α-photon coincidences were proposed along the 288Mc decay chain [10,13], followed
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