Ca-48+Bk-249 Fusion Reaction Leading to Element Z=117: Long-Lived alpha-Decaying (270)Db and Discovery of Lr-266

J. Khuyagbaatar*, A. Yakushev, Ch. E. Duellmann, D. Ackermann, L. -L. Andersson, M. Asai, M. Block, R. A. Boll, H. Brand, D. M. Cox, M. Dasgupta, X. Derkx, A. Di Nitto, K. Eberhardt, J. Even, M. Evers, C. Fahlander, U. Forsberg, J. M. Gates, N. GharibyanP. Golubev, K. E. Gregorich, J. H. Hamilton, W. Hartmann, R. -D. Herzberg, F. P. Hessberger, D. J. Hinde, J. Hoffmann, R. Hollinger, A. Huebner, E. Jaeger, B. Kindler, J. V. Kratz, J. Krier, N. Kurz, M. Laatiaoui, S. Lahiri, R. Lang, B. Lommel, M. Maiti, K. Miernik, S. Minami, A. Mistry, C. Mokry, H. Nitsche, J. P. Omtvedt, G. K. Pang, P. Papadakis, D. Renisch, J. Roberto, D. Rudolph, J. Runke, K. P. Rykaczewski, L. G. Sarmiento, M. Schaedel, B. Schausten, A. Semchenkov, D. A. Shaughnessy, P. Steinegger, J. Steiner, E. E. Tereshatov, P. Thoerle-Pospiech, K. Tinschert, T. Torres De Heidenreich, N. Trautmann, A. Tuerler, J. Uusitalo, D. E. Ward, M. Wegrzecki, N. Wiehl, S. M. Van Cleve, V. Yakusheva

*Corresponding author voor dit werk

Onderzoeksoutput: ArticleAcademicpeer review

228 Citaten (Scopus)

Samenvatting

The superheavy element with atomic number Z = 117 was produced as an evaporation residue in the Ca-48 + Bk-249 fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. The radioactive decay of evaporation residues and their alpha-decay products was studied using a detection setup that allowed measuring decays of single atomic nuclei with half-lives between sub-mu s and a few days. Two decay chains comprising seven a decays and a spontaneous fission each were identified and are assigned to the isotope (294)117 and its decay products. A hitherto unknown alpha-decay branch in (270)Db (Z = 105) was observed, which populated the new isotope Lr-266 (Z = 103). The identification of the long-lived (T-1/2 = 1.0(-0.4)(+1.9) h) alpha-emitter (270)Db marks an important step towards the observation of even more long-lived nuclei of superheavy elements located on an "island of stability."

Originele taal-2English
Artikelnummer172501
Aantal pagina's5
TijdschriftPhysical Review Letters
Volume112
Nummer van het tijdschrift17
DOI's
StatusPublished - 1-mei-2014
Extern gepubliceerdJa

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