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Spectroscopy along flerovium decay chains: Discovery of 280Ds and an excited state in 282Cn

Såmark-Roth, Anton LU ; Cox, Daniel LU ; Rudolph, Dirk LU orcid ; Sarmiento Pico, Luis LU ; Carlsson, Gillis LU ; Egido, J. L. ; Golubev, Pavel LU ; Heery, J.A.M. ; Yakushev, Alexander and Åberg, Sven LU , et al. (2021) In Physical Review Letters 126(3).
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... (More)
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 Qα=10.06(1) MeV. In one case, a Qα=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. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Superheavy elements, Nuclear spectroscopy, Alpha decay, Mean field theory, Island of stability
in
Physical Review Letters
volume
126
issue
3
article number
032503
pages
7 pages
publisher
American Physical Society
external identifiers
  • scopus:85099886176
  • pmid:33543956
ISSN
1079-7114
DOI
10.1103/PhysRevLett.126.032503
project
Spectroscopy along Decay Chains of Element 114, Flerovium
Nuclear Structure at the Limits: Isotope-selective Spectroscopy
Characterization of New Superheavy Elements
language
English
LU publication?
yes
id
2c9efe26-330c-452e-a5c8-bb82e3753087
date added to LUP
2021-01-19 19:58:47
date last changed
2022-05-24 04:13:40
@article{2c9efe26-330c-452e-a5c8-bb82e3753087,
  abstract     = {{A nuclear spectroscopy experiment was conducted to study α-decay chains stemming from isotopes of flerovium (element <i>Z</i>=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 <sup>48</sup>Ca+<sup>242</sup>Pu and <sup>48</sup>Ca+<sup>244</sup>Pu provided a total of 32 flerovium-candidate decay chains, of which two and eleven were firmly assigned to <sup>286</sup>Fl and <sup>288</sup>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 <sup>282</sup>Cn. Spectroscopy of <sup>288</sup>Fl decay chains fixed <i>Q</i><sub>α</sub>=10.06(1) MeV. In one case, a <i>Q</i><sub>α</sub>=9.46(1)-MeV decay from <sup>284</sup>Cn into <sup>280</sup>Ds was observed, with <sup>280</sup>Ds fissioning after only 518 μs. The impact of these findings, aggregated with existing data on decay chains of <sup>286,288</sup>Fl, on the size of an anticipated shell gap at proton number <i>Z</i>=114 is discussed in light of predictions from two beyond-mean-field calculations, which take into account triaxial deformation.}},
  author       = {{Såmark-Roth, Anton and Cox, Daniel and Rudolph, Dirk and Sarmiento Pico, Luis and Carlsson, Gillis and Egido, J. L. and Golubev, Pavel and Heery, J.A.M. and Yakushev, Alexander and Åberg, Sven and Albers, Helena M. and Albertsson, Martin and Block, M. and Brand, H. and Calverley, T. and Cantemir, R. and Clark, Roderick M. and Düllmann, Ch. E. and Eberth, J and Fahlander, Claes and Forsberg, Ulrika and Gates, J. M. and Giacoppo, F. and Götz, Michael and Götz, Stefan and Herzberg, R.-D. and Hrabar, Yuliia and Jäger, E. and Judson, D. and Khuyagbaatar, J. and Kindler, Birgit and Kojouharov, I. and Kratz, Jens-Volker and Krier, J. and Kurz, N. and Lens, L. and Ljungberg, Jimmy and Lommel, Bettina and Louko, J. and Meyer, Carl-Christian and Mistry, A. and Mokry, C. and Papadakis, P. and Parr, E. and Pore, J. L. and Ragnarsson, Ingemar and Runke, J. and Schädel, Matthias and Schaffner, H. and Schausten, B. and Shaughnessy, D. A. and Thörle-Pospiech, P. and Trautmann, N. and Uusitalo, J.}},
  issn         = {{1079-7114}},
  keywords     = {{Superheavy elements; Nuclear spectroscopy; Alpha decay; Mean field theory; Island of stability}},
  language     = {{eng}},
  month        = {{01}},
  number       = {{3}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Spectroscopy along flerovium decay chains: Discovery of <sup>280</sup>Ds and an excited state in <sup>282</sup>Cn}},
  url          = {{https://lup.lub.lu.se/search/files/90341425/PhysRevLett.126.032503.pdf}},
  doi          = {{10.1103/PhysRevLett.126.032503}},
  volume       = {{126}},
  year         = {{2021}},
}