<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. KhuyagbaatarHelmholtz Institute Mainz, 55099 Mainz, Germany and GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyA. YakushevGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyCh. E. DüllmannHelmholtz Institute Mainz, 55099 Mainz, Germany and GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, GermanyD. AckermannGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyL.-L. AnderssonHelmholtz Institute Mainz, 55099 Mainz, GermanyM. AsaiAdvanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, JapanM. BlockGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyR. A. BollOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAH.S. BrandGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyD. M. CoxUniversity of Liverpool, Liverpool L69 7ZE, United KingdomM. DasguptaThe Australian National University, Canberra, Australian Capital Territory 0200, AustraliaX. DerkxHelmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, GermanyA. Di NittoJohannes Gutenberg-Universität Mainz, 55099 Mainz, GermanyΚ. EberhardtHelmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, GermanyJ. EvenHelmholtz Institute Mainz, 55099 Mainz, GermanyM. EversThe Australian National University, Canberra, Australian Capital Territory 0200, AustraliaC. FahlanderLund University, 22100 Lund, SwedenU. ForsbergLund University, 22100 Lund, SwedenJ. M. GatesLawrence Berkeley National Laboratory, Berkeley, California 94720, USAN. GharibyanLawrence Livermore National Laboratory, Livermore, California 94551, USAP. GolubevLund University, 22100 Lund, SwedenΚ. Ε. GregorichLawrence Berkeley National Laboratory, Berkeley, California 94720, USAJ. H. HamiltonVanderbilt University, Nashville, Tennessee 37235, USAW. HartmannGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyR.-D. HerzbergUniversity of Liverpool, Liverpool L69 7ZE, United KingdomF. P. HeßbergerHelmholtz Institute Mainz, 55099 Mainz, Germany and GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyD. J. HindeThe Australian National University, Canberra, Australian Capital Territory 0200, AustraliaJ. HoffmannGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyR. HollingerGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyA. HübnerGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyE. JägerGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyB. KindlerGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyJens Volker KratzJohannes Gutenberg-Universität Mainz, 55099 Mainz, GermanyJ. KrierGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyN. KurzGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyM. LaatiaouiHelmholtz Institute Mainz, 55099 Mainz, GermanySusanta LahiriSaha Institute of Nuclear Physics, Kolkata 700064, IndiaR. LangGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyB. LommelGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyMoumita MaitiSaha Institute of Nuclear Physics, Kolkata 700064, IndiaK. MiernikOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAS. MinamiGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyA. MistryUniversity of Liverpool, Liverpool L69 7ZE, United KingdomC. MokryHelmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, GermanyH. NitscheLawrence Berkeley National Laboratory, Berkeley, California 94720, USAJ. P. OmtvedtUniversity of Oslo, 0315 Oslo, NorwayG. K. PangLawrence Berkeley National Laboratory, Berkeley, California 94720, USAP. PapadakisUniversity of Liverpool, Liverpool L69 7ZE, United Kingdom and University of Jyväskylä, 40351 Jyväskylä, FinlandDennis RenischJohannes Gutenberg-Universität Mainz, 55099 Mainz, GermanyJ. B. RobertoOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAD. RudolphLund University, 22100 Lund, SwedenJ. RunkeGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyK. P. RykaczewskiOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAL. G. SarmientoLund University, 22100 Lund, SwedenM. SchädelGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany and Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, JapanΒ. SchaustenGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyA. SemchenkovUniversity of Oslo, 0315 Oslo, NorwayD. A. ShaughnessyLawrence Livermore National Laboratory, Livermore, California 94551, USAP. SteineggerPaul Scherrer Institute, 5232 Villigen, Switzerland and University of Bern, 3012 Bern, SwitzerlandJ. SteinerGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyE. E. TereshatovLawrence Livermore National Laboratory, Livermore, California 94551, USAP. Thörle-PospiechHelmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, GermanyK. TinschertGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyT. Torres De HeidenreichGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyΝ. TrautmannJohannes Gutenberg-Universität Mainz, 55099 Mainz, GermanyΑ. TürlerPaul Scherrer Institute, 5232 Villigen, Switzerland and University of Bern, 3012 Bern, SwitzerlandJ. UusitaloUniversity of Jyväskylä, 40351 Jyväskylä, FinlandD. WardLund University, 22100 Lund, SwedenM. WęgrzeckiInstitute of Electron Technology, 02-668 Warsaw, PolandN. WiehlHelmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, GermanyShelley M. Van CleveOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAV. YakushevaHelmholtz Institute Mainz, 55099 Mainz, Germany
2014lv
ABI
Аннотация
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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