<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Ca</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>48</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo>+</mml:mo><mml:mmultiscripts><mml:mrow><mml:mi>Bk</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>249</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>Fusion Reaction Leading to Element<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Z</mml:mi><mml:mo>=</mml:mo><mml:mn>117</mml:mn></mml:mrow></mml:math>: Long-Lived<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>-Decaying<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Db</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>270</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>and Discovery of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Lr</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>266</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>

J. Khuyagbaatar; A. Yakushev; Ch. E. Düllmann; D. Ackermann; L.-L. Andersson; M. Asai; M. Block; R. A. Boll; H.S. Brand; D. M. Cox; M. Dasgupta; X. Derkx; A. Di Nitto; Κ. Eberhardt; J. Even; M. Evers; C. Fahlander; U. Forsberg; J. M. Gates; N. Gharibyan; P. Golubev; Κ. Ε. Gregorich; J. H. Hamilton; W. Hartmann; R.-D. Herzberg; F. P. Heßberger; D. J. Hinde; J. Hoffmann; R. Hollinger; A. Hübner; E. Jäger; B. Kindler; Jens Volker Kratz; J. Krier; N. Kurz; M. Laatiaoui; Susanta Lahiri; R. Lang; B. Lommel; Moumita Maiti; K. Miernik; S. Minami; A. Mistry; C. Mokry; H. Nitsche; J. P. Omtvedt; G. K. Pang; P. Papadakis; Dennis Renisch; J. B. Roberto; D. Rudolph; J. Runke; K. P. Rykaczewski; L. G. Sarmiento; M. Schädel; Β. Schausten; A. Semchenkov; D. A. Shaughnessy; P. Steinegger; J. Steiner; E. E. Tereshatov; P. Thörle-Pospiech; K. Tinschert; T. Torres De Heidenreich; Ν. Trautmann; Α. Türler; J. Uusitalo; D. Ward; M. Węgrzecki; N. Wiehl; Shelley M. Van Cleve; V. Yakusheva

doi:10.1103/physrevlett.112.172501

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Ca</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>48</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo>+</mml:mo><mml:mmultiscripts><mml:mrow><mml:mi>Bk</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>249</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>Fusion Reaction Leading to Element<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Z</mml:mi><mml:mo>=</mml:mo><mml:mn>117</mml:mn></mml:mrow></mml:math>: Long-Lived<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>-Decaying<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Db</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>270</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>and Discovery of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Lr</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>266</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>

J. Khuyagbaatar(Helmholtz Institute Mainz), A. Yakushev(GSI Helmholtz Centre for Heavy Ion Research), Ch. E. Düllmann(Johannes Gutenberg University Mainz), D. Ackermann(GSI Helmholtz Centre for Heavy Ion Research), L.-L. Andersson(Johannes Gutenberg University Mainz), M. Asai(Advanced Science Research Center), M. Block(GSI Helmholtz Centre for Heavy Ion Research), R. A. Boll(Oak Ridge National Laboratory), H.S. Brand(GSI Helmholtz Centre for Heavy Ion Research), D. M. Cox(University of Liverpool), M. Dasgupta(Australian National University), X. Derkx(Johannes Gutenberg University Mainz), A. Di Nitto(Johannes Gutenberg University Mainz), Κ. Eberhardt(Johannes Gutenberg University Mainz), J. Even(Johannes Gutenberg University Mainz), M. Evers(Australian National University), C. Fahlander(Lund University), U. Forsberg(Lund University), J. M. Gates(Lawrence Berkeley National Laboratory), N. Gharibyan(Lawrence Livermore National Laboratory), P. Golubev(Lund University), Κ. Ε. Gregorich(Lawrence Berkeley National Laboratory), J. H. Hamilton(Vanderbilt University), W. Hartmann(GSI Helmholtz Centre for Heavy Ion Research), R.-D. Herzberg(University of Liverpool), F. P. Heßberger(Johannes Gutenberg University Mainz), D. J. Hinde(Australian National University), J. Hoffmann(GSI Helmholtz Centre for Heavy Ion Research), R. Hollinger(GSI Helmholtz Centre for Heavy Ion Research), A. Hübner(GSI Helmholtz Centre for Heavy Ion Research), E. Jäger(GSI Helmholtz Centre for Heavy Ion Research), B. Kindler(GSI Helmholtz Centre for Heavy Ion Research), Jens Volker Kratz(Johannes Gutenberg University Mainz), J. Krier(GSI Helmholtz Centre for Heavy Ion Research), N. Kurz(GSI Helmholtz Centre for Heavy Ion Research), M. Laatiaoui(Johannes Gutenberg University Mainz), Susanta Lahiri(Saha Institute of Nuclear Physics), R. Lang(GSI Helmholtz Centre for Heavy Ion Research), B. Lommel(GSI Helmholtz Centre for Heavy Ion Research), Moumita Maiti(Saha Institute of Nuclear Physics), K. Miernik(Oak Ridge National Laboratory), S. Minami(GSI Helmholtz Centre for Heavy Ion Research), A. Mistry(University of Liverpool), C. Mokry(Helmholtz Institute Mainz), H. Nitsche(Lawrence Berkeley National Laboratory), J. P. Omtvedt(University of Oslo), G. K. Pang(Lawrence Berkeley National Laboratory), P. Papadakis(University of Jyväskylä), Dennis Renisch(Johannes Gutenberg University Mainz), J. B. Roberto(Oak Ridge National Laboratory), D. Rudolph(Lund University), J. Runke(GSI Helmholtz Centre for Heavy Ion Research), K. P. Rykaczewski(Oak Ridge National Laboratory), L. G. Sarmiento(Lund University), M. Schädel(Japan Atomic Energy Agency), Β. Schausten(GSI Helmholtz Centre for Heavy Ion Research), A. Semchenkov(University of Oslo), D. A. Shaughnessy(Lawrence Livermore National Laboratory), P. Steinegger(University of Bern), J. Steiner(GSI Helmholtz Centre for Heavy Ion Research), E. E. Tereshatov(Lawrence Livermore National Laboratory), P. Thörle-Pospiech(Johannes Gutenberg University Mainz), K. Tinschert(GSI Helmholtz Centre for Heavy Ion Research), T. Torres De Heidenreich(GSI Helmholtz Centre for Heavy Ion Research), Ν. Trautmann(Johannes Gutenberg University Mainz), Α. Türler(Paul Scherrer Institute), J. Uusitalo(University of Jyväskylä), D. Ward(Lund University), M. Węgrzecki(Institute of Electron Technology), N. Wiehl(Johannes Gutenberg University Mainz), Shelley M. Van Cleve(Oak Ridge National Laboratory), V. Yakusheva(Helmholtz Institute Mainz)

Physical Review Letters

May 1, 2014

10.1103/physrevlett.112.172501

Cited by 261Open Access

Full Text

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 -decay products was studied using a detection setup that allowed measuring decays of single atomic nuclei with half-lives between sub-s and a few days. Two decay chains comprising seven decays and a spontaneous fission each were identified and are assigned to the isotope 294 117 and its decay products. A hitherto unknown -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 1.9 -0.4 h) -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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