Review of even element super-heavy nuclei and search for element 120

Hofmann, S.; Heinz, S.; Mann, R.; Maurer, J.; Munzenberg, G.; Antalic, S.; Barth, W.; Burkhard, H. G.; Dahl, L.; Eberhardt, K.; Grzywacz, Robert Kazimierz; Hamilton, J. H.; Henderson, R. A.; Kenneally, J. M.; Kindler, B.; Kojouharov, I.; Lang, R.; Lommel, B.; Miernik, K.; Miller, D.; Moody, K. J.; Morita, K.; Nishio, K.; Popeko, A. G.; Roberto, James B.; Runke, J.; Rykaczewski, Krzysztof P.; Saro, S.; Scheidenberger, C.; Schott, H. J.; Shaughnessy, D. A.; Stoyer, M. A.; Thorle-Pospiech, P.; Tinschert, K.; Trautmann, N.; Uusitalo, J.; Yeremin, A. V.

doi:10.1140/epja/i2016-16180-4

Review of even element super-heavy nuclei and search for element 120

Journal Article · Tue Jun 28 00:00:00 EDT 2016 · European Physical Journal. A

DOI:https://doi.org/10.1140/epja/i2016-16180-4· OSTI ID:1410078

Hofmann, S. ^[1]; Heinz, S. ^[2]; Mann, R. ^[2]; Maurer, J. ^[2]; Munzenberg, G. ^[3]; Antalic, S. ^[4]; Barth, W. ^[2]; Burkhard, H. G. ^[2]; Dahl, L. ^[2]; Eberhardt, K. ^[5]; ^[6]; Hamilton, J. H. ^[7]; Henderson, R. A. ^[8]; Kenneally, J. M. ^[8]; Kindler, B. ^[2]; Kojouharov, I. ^[2]; Lang, R. ^[2]; Lommel, B. ^[2]; Miernik, K. ^[9]; Miller, D. ^[10] more »

GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Goethe-Univ. Frankfurt, Frankfurt (Germany)
GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Manipal Univ., Karnataka (India)
Comenius Univ., Bratislava (Slovakia)
Johannes Gutenberg-Univ. Mainz, Mainz (Germany)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Vanderbilt Univ., Nashville, TN (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Warsaw, Warsaw (Poland)
Univ. of Tennessee, Knoxville, TN (United States)
RIKEN Nishina Center for Accelerator-Based Science, Saitama (Japan)
Japan Atomic Energy Agency, Ibaraki (Japan)
Joint Institute for Nuclear Research, Dubna (Russian Federation)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Jyvaskyla, Jyvaskyla (Finland)

The reaction 54Cr$ + $248Cm was investigated at the velocity filter SHIP at GSI, Darmstadt, with the intention to study production and decay properties of isotopes of element 120. Three correlated signals were measured, which occurred within a period of 279ms. The heights of the signals correspond with the expectations for a decay sequence starting with an isotope of element 120. However, a complete decay chain cannot be established, since a signal from the implantation of the evaporation residue cannot be identified unambiguously. Measured properties of the event chain are discussed in detail. The result is compared with theoretical predictions. Previously measured decay properties of even element super-heavy nuclei were compiled in order to find arguments for an assignment from the systematics of experimental data. In the course of this review, a few tentatively assigned data could be corrected. New interpretations are given for results which could not be assigned definitely in previous studies. The discussion revealed that the cross-section for production of element 120 could be high enough so that a successful experiment seems possible with presently available techniques. However, a continuation of the experiment at SHIP for a necessary confirmation of the results obtained in a relatively short irradiation of five weeks is not possible at GSI presently. Furthermore, we decided to publish the results of the measurement and of the review as they exist now. In the summary and outlook section we also present concepts for the continuation of research in the field of super-heavy nuclei.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-00OR22725; AC52-07NA27344

OSTI ID:: 1410078

Alternate ID(s):: OSTI ID: 1763503
OSTI ID: 22530134

Report Number(s):: LLNL-JRNL--684167

Journal Information:: European Physical Journal. A, Journal Name: European Physical Journal. A Journal Issue: 6 Vol. 52; ISSN 1434-6001

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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