48Ca+249Bk fusion reaction leading to element Z = 117: long-lived α-decaying 270Db and discovery of 266Lr.

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(Japan Atomic Energy Agency), 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), J. V. 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(Helmholtz Institute 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(Johannes Gutenberg University Mainz), H. Nitsche(Lawrence Berkeley National Laboratory), J. P. Omtvedt(University of Oslo), G. K. Pang(Lawrence Berkeley National Laboratory), P. Papadakis(University of Liverpool), 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, 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, 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(Johannes Gutenberg University Mainz)
PubMed
May 2, 2014
10.1103/physrevlett.112.172501
Cited by 140

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."

Related Papers

No related papers found

Powered by citation graph analysis