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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/25372
Title: Ca 48 + Bk 249 fusion reaction leading to element Z=117: Long-lived α -decaying Db 270 and discovery of Lr 266
Authors: 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, Moumita
Miernik K.
Minami S.
Mistry A.
Mokry C.
Nitsche H.
Omtvedt J.P.
Pang G.K.
Papadakis P.
Renisch D.
Roberto J.
Rudolph D.
Runke J.
Rykaczewski K.P.
Sarmiento L.G.
Schädel M.
Schausten B.
Semchenkov A.
Shaughnessy D.A.
Steinegger P.
Steiner J.
Tereshatov E.E.
Thörle-Pospiech P.
Tinschert K.
Torres De Heidenreich T.
Trautmann N.
Türler A.
Uusitalo J.
Ward D.E.
Wegrzecki M.
Wiehl N.
Van Cleve S.M.
Yakusheva V.
Published in: Physical Review Letters
Abstract: The superheavy element with atomic number Z=117 was produced as an evaporation residue in the Ca48+Bk249 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 117294 and its decay products. A hitherto unknown α-decay branch in Db270 (Z=105) was observed, which populated the new isotope Lr266 (Z=103). The identification of the long-lived (T1/2=1.0-0.4+1.9h) α-emitter Db270 marks an important step towards the observation of even more long-lived nuclei of superheavy elements located on an "island of stability." © 2014 American Physical Society.
Citation: Physical Review Letters, 112(17)
URI: https://doi.org/10.1103/PhysRevLett.112.172501
http://repository.iitr.ac.in/handle/123456789/25372
Issue Date: 2014
Publisher: American Physical Society
ISSN: 319007
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Author Affiliations: Khuyagbaatar, J., Helmholtz Institute Mainz, 55099 Mainz, Germany, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
Yakushev, A., GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
Düllmann, Ch.E., Helmholtz Institute Mainz, 55099 Mainz, Germany, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
Ackermann, D., GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
Andersson, L.-L., 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, R.A., Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
Brand, H., GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
Cox, D.M., University of Liverpool, Liverpool L69 7ZE, United Kingdom
Dasgupta, M., Australian National University, Canberra, ACT 0200, Australia
Derkx, X., Helmholtz Institute Mainz, 55099 Mainz, Germany, 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, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
Even, J., Helmholtz Institute Mainz, 55099 Mainz, Germany
Evers, M., Australian National University, Canberra, ACT 0200, Australia
Fahlander, C., Lund University, 22100 Lund, Sweden
Forsberg, U., Lund University, 22100 Lund, Sweden
Gates, J.M., Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States
Gharibyan, N., Lawrence Livermore National Laboratory, Livermore, CA 94551, United States
Golubev, P., Lund University, 22100 Lund, Sweden
Gregorich, K.E., Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States
Hamilton, J.H., Vanderbilt University, Nashville, TN 37235, United States
Hartmann, W., GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
Herzberg, R.-D., University of Liverpool, Liverpool L69 7ZE, United Kingdom
Heßberger, F.P., Helmholtz Institute Mainz, 55099 Mainz, Germany, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
Hinde, D.J., Australian National University, Canberra, ACT 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, J.V., 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, TN 37831, United States
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, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
Nitsche, H., Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States
Omtvedt, J.P., University of Oslo, 0315 Oslo, Norway
Pang, G.K., Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States
Papadakis, P., University of Liverpool, Liverpool L69 7ZE, United Kingdom, University of Jyväskylä, 40351 Jyväskylä, Finland
Renisch, D., Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
Roberto, J., Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
Rudolph, D., Lund University, 22100 Lund, Sweden
Runke, J., GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
Rykaczewski, K.P., Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
Sarmiento, L.G., Lund University, 22100 Lund, Sweden
Schädel, M., GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany, Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
Schausten, B., GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
Semchenkov, A., University of Oslo, 0315 Oslo, Norway
Shaughnessy, D.A., Lawrence Livermore National Laboratory, Livermore, CA 94551, United States
Steinegger, P., Paul Scherrer Institute, 5232 Villigen, Switzerland, University of Bern, 3012 Bern, Switzerland
Steiner, J., GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
Tereshatov, E.E., Lawrence Livermore National Laboratory, Livermore, CA 94551, United States
Thörle-Pospiech, P., Helmholtz Institute Mainz, 55099 Mainz, Germany, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
Tinschert, K., GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
Torres De Heidenreich, T., GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
Trautmann, N., Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
Türler, A., Paul Scherrer Institute, 5232 Villigen, Switzerland, University of Bern, 3012 Bern, Switzerland
Uusitalo, J., University of Jyväskylä, 40351 Jyväskylä, Finland
Ward, D.E., Lund University, 22100 Lund, Sweden
Wegrzecki, M., Institute of Electron Technology, 02-668 Warsaw, Poland
Wiehl, N., Helmholtz Institute Mainz, 55099 Mainz, Germany, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
Van Cleve, S.M., Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
Yakusheva, V., Helmholtz Institute Mainz, 55099 Mainz, Germany
Funding Details: DE-FG05-88ER40407; Science and Technology Facilities Council, STFC: ST/F012039/1, ST/J000094/1
Corresponding Author: Khuyagbaatar, J.; Helmholtz Institute Mainz, 55099 Mainz, Germany; email: J.Khuyagbaatar@gsi.de
Appears in Collections:Journal Publications [PH]

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