Spectroscopy along Flerovium Decay Chains: Discovery ofDs<mml:mprescripts/><mml:none/>280and an Excited State inCn<mml:mprescripts/><mml:none/>282

2021/01/22 by A. Såmark-Roth, D. M. Cox, D. Rudolph +51 · 63 citations
Physics and Astronomy · #Advanced Chemical Physics Studies #Atomic physics #Computer science #Excited state #Nuclear physics research studies #Physics #Quantum mechanics #Rare-earth and actinide compounds #Spectroscopy

paper · pdf · doi:10.1103/physrevlett.126.032503

published in Physical Review Letters 126(3), 032503 (American Physical Society)

openalex publication_date 2021/01/22 · openalex created_date 2021/02/01 · openalex updated_date 2026/08/06

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 ⁴⁸Ca+²⁴²Pu and ⁴⁸Ca+²⁴⁴Pu provided a total of 32 flerovium-candidate decay chains, of which two and eleven were firmly assigned to ²⁸⁶Fl and ²⁸⁸Fl, 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 ²⁸²Cn. Spectroscopy of ²⁸⁸Fl decay chains fixed Q_α=10.06(1) MeV. In one case, a Q_α=9.46(1)-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=114 is discussed in light of predictions from two beyond-mean-field calculations, which take into account triaxial deformation.

Citations

• New Superheavy Element Isotopes:Pu<mml:mprescripts/><mml:none/>242(Ca<mml:mprescripts/><mml:none/>48,5n)1<mml:mprescripts/><mml:none/>28514
• Synthesis of the isotopes of elements 118 and 116 in theCf<mml:mprescripts/><mml:none/>249andCm<mml:mprescripts/><mml:none/>245+Ca<mml:mprescripts/><mml:none/>48fusion reactions
• Study of the Reaction48Ca +248Cm →296Lv*at RIKEN-GARIS
• Recoil-α-fission and recoil-α–α-fission events observed in the reaction 48Ca + 243Am
• Shape coexistence and triaxiality in the superheavy nuclei
• Superheavy Element Flerovium (Element 114) Is a Volatile Metal
• Spectroscopy of Element 115 Decay Chains
• Microscopic mechanism of charged-particle radioactivity and generalization of the Geiger-Nuttall law
• Decay spectroscopy of element 115 daughters:Rg<mml:mprescripts/><mml:none/>280→Mt<mml:mprescripts/><mml:none/>276andMt<mml:mprescripts/><mml:none/>276→Bh<mml:mprescripts/><mml:none/>272
• Gas-phase chemistry of element 114, flerovium
• Measurements of cross sections and decay properties of the isotopes of elements 112, 114, and 116 produced in the fusion reactionsU<mml:mprescripts/><mml:none/>233,238,Pu<mml:mprescripts/><mml:none/>242, andCm<mml:mprescripts/><mml:none/>248+Ca<mml:mprescripts/><mml:none/>48
• Measurements of cross sections for the fusion-evaporation reactionsPu<mml:mprescripts/><mml:none/>244(Ca<mml:mprescripts/><mml:none/>48,xn)292−x114andCm<mml:mprescripts/><mml:none/>245(Ca<mml:mprescripts/><mml:none/>48,xn)293−x116

Cited by

• New isotope Mc<mml:mprescripts/><mml:none/>286 produced in the Am<mml:mprescripts/><mml:none/>243+Ca<mml:mprescripts/><mml:none/>48 reaction
• Copernicium [wikipedia]
• Darmstadtium [wikipedia]
• Island of stability [wikipedia]
• Isotopes of darmstadtium [wikipedia]

Related

• Spectroscopy of Element 115 Decay Chains
• A new assessment of the alleged link between element 115 and element 117 decay chains
• Experiments on the synthesis of superheavy nucleiFl<mml:mprescripts/><mml:none/>284andFl<mml:mprescripts/><mml:none/>285in thePu<mml:mprescripts/><mml:none/>239,240+Ca<mml:mprescripts/><mml:none/>48reactions
• Decay spectroscopy of element 115 daughters:Rg<mml:mprescripts/><mml:none/>280→Mt<mml:mprescripts/><mml:none/>276andMt<mml:mprescripts/><mml:none/>276→Bh<mml:mprescripts/><mml:none/>272
• Investigation of Ca<mml:mprescripts/><mml:none/>48-induced reactions with Pu<mml:mprescripts/><mml:none/>242 and U<mml:mprescripts/><mml:none/>238 targets at the JINR Superheavy Element Factory