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48Ca+249Bk fusion reaction leading to element Z = 117: long-lived α-decaying 270Db and discovery of 266Lr.
Khuyagbaatar, J; Yakushev, A; Düllmann, Ch E; Ackermann, D; Andersson, L-L; Asai, M; Block, M; Boll, R A; Brand, H; Cox, D M; Dasgupta, M; Derkx, X; Di Nitto, A; Eberhardt, K; Even, J; Evers, M; Fahlander, C; Forsberg, U; Gates, J M; Gharibyan, N; Golubev, P; Gregorich, K E; Hamilton, J H; Hartmann, W; Herzberg, R-D; Heßberger, F P; Hinde, D J; Hoffmann, J; Hollinger, R; Hübner, A; Jäger, E; Kindler, B; Kratz, J V; Krier, J; Kurz, N; Laatiaoui, M; Lahiri, S; Lang, R; Lommel, B; Maiti, M; Miernik, K; Minami, S; Mistry, A; Mokry, C; Nitsche, H; Omtvedt, J P; Pang, G K; Papadakis, P; Renisch, D; Roberto, J.
Affiliation
  • Khuyagbaatar J; Helmholtz Institute Mainz, 55099 Mainz, Germany and GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • Yakushev A; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • Düllmann ChE; Helmholtz Institute Mainz, 55099 Mainz, Germany and GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany.
  • Ackermann D; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • Andersson LL; Helmholtz Institute Mainz, 55099 Mainz, Germany.
  • Asai M; Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan.
  • Block M; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • Boll RA; Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  • Brand H; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • Cox DM; University of Liverpool, Liverpool L69 7ZE, United Kingdom.
  • Dasgupta M; The Australian National University, Canberra, Australian Capital Territory 0200, Australia.
  • Derkx X; Helmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany.
  • Di Nitto A; Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany.
  • Eberhardt K; Helmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany.
  • Even J; Helmholtz Institute Mainz, 55099 Mainz, Germany.
  • Evers M; The Australian National University, Canberra, Australian Capital Territory 0200, Australia.
  • Fahlander C; Lund University, 22100 Lund, Sweden.
  • Forsberg U; Lund University, 22100 Lund, Sweden.
  • Gates JM; Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
  • Gharibyan N; Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
  • Golubev P; Lund University, 22100 Lund, Sweden.
  • Gregorich KE; Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
  • Hamilton JH; Vanderbilt University, Nashville, Tennessee 37235, USA.
  • Hartmann W; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • Herzberg RD; University of Liverpool, Liverpool L69 7ZE, United Kingdom.
  • Heßberger FP; Helmholtz Institute Mainz, 55099 Mainz, Germany and GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • Hinde DJ; The Australian National University, Canberra, Australian Capital Territory 0200, Australia.
  • Hoffmann J; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • Hollinger R; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • Hübner A; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • Jäger E; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • Kindler B; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • Kratz JV; Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany.
  • Krier J; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • Kurz N; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • Laatiaoui M; Helmholtz Institute Mainz, 55099 Mainz, Germany.
  • Lahiri S; Saha Institute of Nuclear Physics, Kolkata 700064, India.
  • Lang R; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • Lommel B; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • Maiti M; Saha Institute of Nuclear Physics, Kolkata 700064, India.
  • Miernik K; Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  • Minami S; GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany.
  • Mistry A; University of Liverpool, Liverpool L69 7ZE, United Kingdom.
  • Mokry C; Helmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany.
  • Nitsche H; Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
  • Omtvedt JP; University of Oslo, 0315 Oslo, Norway.
  • Pang GK; Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
  • Papadakis P; University of Liverpool, Liverpool L69 7ZE, United Kingdom and University of Jyväskylä, 40351 Jyväskylä, Finland.
  • Renisch D; Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany.
  • Roberto J; Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Phys Rev Lett ; 112(17): 172501, 2014 May 02.
Article in En | MEDLINE | ID: mdl-24836239
ABSTRACT
The superheavy element with atomic number Z=117 was produced as an evaporation residue in the (48)Ca+(249)Bk fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. The radioactive decay of evaporation residues and their α-decay products was studied using a detection setup that allowed measuring decays of single atomic nuclei with half-lives between sub-µs and a few days. Two decay chains comprising seven α decays and a spontaneous fission each were identified and are assigned to the isotope (294)117 and its decay products. A hitherto unknown α-decay branch in (270)Db (Z = 105) was observed, which populated the new isotope (266)Lr (Z = 103). The identification of the long-lived (T(1/2) = 1.0(-0.4)(+1.9) h) α-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."
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Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2014 Document type: Article Affiliation country:
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Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2014 Document type: Article Affiliation country: