Search for elements 119 and 120
J. KhuyagbaatarGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyA. YakushevGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyCh. E. DüllmannGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, 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, England, United KingdomM. DasguptaDepartment of Nuclear Physics, RSP, The Australian National University, Canberra, ACT 2601, AustraliaX. DerkxHelmholtz Institute Mainz, 55099 Mainz, GermanyA. Di NittoJohannes Gutenberg-Universität Mainz, 55099 Mainz, GermanyΚ. EberhardtHelmholtz Institute Mainz, 55099 Mainz, GermanyJ. EvenHelmholtz Institute Mainz, 55099 Mainz, GermanyM. EversDepartment of Nuclear Physics, RSP, The Australian National University, Canberra, ACT 2601, 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, England, United KingdomF. P. HeßbergerGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyD. J. HindeDepartment of Nuclear Physics, RSP, The Australian National University, Canberra, ACT 2601, 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. LaatiaouiGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, 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. MistryGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyC. MokryHelmholtz Institute 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 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. SchädelAdvanced 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 PSI, SwitzerlandJ. SteinerGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyE. E. TereshatovLawrence Livermore National Laboratory, Livermore, California 94551, USAP. Thörle-PospiechHelmholtz Institute 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 PSI, SwitzerlandJ. UusitaloUniversity of Jyväskylä, 40351 Jyväskylä, FinlandM. WęgrzeckiŁukasiewicz—Institute of Electron Technology, 02-668 Warsaw, PolandN. WiehlHelmholtz Institute Mainz, 55099 Mainz, GermanyShelley M. Van CleveOak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USAV. YakushevaHelmholtz Institute Mainz, 55099 Mainz, Germany
2020en
ABI
Annotatsiya
A search for production of the superheavy elements with atomic numbers 119 and 120 was performed in the $^{50}\mathrm{Ti}+^{249}\mathrm{Bk}$ and $^{50}\mathrm{Ti}+^{249}\mathrm{Cf}$ fusion-evaporation reactions, respectively, at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. Over four months of irradiation, the $^{249}\mathrm{Bk}$ target partially decayed into $^{249}\mathrm{Cf}$, which allowed for a simultaneous search for both elements. Neither was detected at cross-section sensitivity levels of 65 and 200 fb for the $^{50}\mathrm{Ti}+^{249}\mathrm{Bk}$ and $^{50}\mathrm{Ti}+^{249}\mathrm{Cf}$ reactions, respectively, at a midtarget beam energy of ${E}_{\mathrm{lab}}=281.5$ MeV. The nonobservation of elements 119 and 120 is discussed within the concept of fusion-evaporation reactions including various theoretical predictions on the fission-barrier heights of superheavy nuclei in the region of the island of stability.
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