| Literature DB >> 33543956 |
A Såmark-Roth1, D M Cox1, D Rudolph1, L G Sarmiento1, B G Carlsson1, J L Egido2, P Golubev1, J Heery3, A Yakushev4, S Åberg1, H M Albers4, M Albertsson1, M Block4,5,6, H Brand4, T Calverley3, R Cantemir4, R M Clark7, Ch E Düllmann4,5,6, J Eberth8, C Fahlander1, U Forsberg1, J M Gates7, F Giacoppo4,5, M Götz4,5,6, S Götz4,5,6, R-D Herzberg3, Y Hrabar1, E Jäger4, D Judson3, J Khuyagbaatar4,5, B Kindler4, I Kojouharov4, J V Kratz6, J Krier4, N Kurz4, L Lens4,6, J Ljungberg1, B Lommel4, J Louko9, C-C Meyer5,6, A Mistry4,10, C Mokry5,6, P Papadakis3, E Parr4, J L Pore7, I Ragnarsson1, J Runke4,6, M Schädel4, H Schaffner4, B Schausten4, D A Shaughnessy11, P Thörle-Pospiech5,6, N Trautmann6, J Uusitalo9.
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.Entities:
Year: 2021 PMID： 33543956 DOI： 10.1103/PhysRevLett.126.032503
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161