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. 2021 Jan 22;126(3):032503.
doi: 10.1103/PhysRevLett.126.032503.

Spectroscopy along Flerovium Decay Chains: Discovery of ^{280}Ds and an Excited State in ^{282}Cn

A Såmark-Roth  1 , D M Cox  1 , D Rudolph  1 , L G Sarmiento  1 , B G Carlsson  1 , J L Egido  2 , P Golubev  1 , J Heery  3 , A Yakushev  4 , S Åberg  1 , H M Albers  4 , M Albertsson  1 , M Block  4   5   6 , H Brand  4 , T Calverley  3 , R Cantemir  4 , R M Clark  7 , Ch E Düllmann  4   5   6 , J Eberth  8 , C Fahlander  1 , U Forsberg  1 , J M Gates  7 , F Giacoppo  4   5 , M Götz  4   5   6 , S Götz  4   5   6 , R-D Herzberg  3 , Y Hrabar  1 , E Jäger  4 , D Judson  3 , J Khuyagbaatar  4   5 , B Kindler  4 , I Kojouharov  4 , J V Kratz  6 , J Krier  4 , N Kurz  4 , L Lens  4   6 , J Ljungberg  1 , B Lommel  4 , J Louko  9 , C-C Meyer  5   6 , A Mistry  4   10 , C Mokry  5   6 , P Papadakis  3 , E Parr  4 , J L Pore  7 , I Ragnarsson  1 , J Runke  4   6 , M Schädel  4 , H Schaffner  4 , B Schausten  4 , D A Shaughnessy  11 , P Thörle-Pospiech  5   6 , N Trautmann  6 , J Uusitalo  9
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Free article

Spectroscopy along Flerovium Decay Chains: Discovery of ^{280}Ds and an Excited State in ^{282}Cn

A Såmark-Roth et al. Phys Rev Lett. .
Free article

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.

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