Search for elements 119 and 120

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, M.; Miernik, K.; Minami, S.; Mistry, A. K.; Mokry, C.; Nitsche, H.; Omtvedt, J. P.; Pang, G. K.; Papadakis, P.; Renisch, D.; Roberto, J. B.; 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.; Wegrzecki, M.; Wiehl, N.; Van Cleve, S. M.; Yakusheva, V.

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Search for elements 119 and 120

Abstract

A search for production of the superheavy elements with atomic numbers 119 and 120 was performed in the 50Ti+249Bk and 50Ti+249Cf fusion-evaporation reactions, respectively, at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. Over four months of irradiation, the 249Bk target partially decayed into 249Cf, which allowed for a simultaneous search for both elements. Neither was detected at cross-section sensitivity levels of 65 and 200 fb for the 50Ti+249Bk and 50Ti+249Cf reactions, respectively, at a midtarget beam energy of Elab=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.

Main 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, M. Miernik, K. Minami, S. Mistry, A. K. Mokry, C. Nitsche, H. Omtvedt, J. P. Pang, G. K. Papadakis, P. Renisch, D. Roberto, J. B. 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. Wegrzecki, M. Wiehl, N. Van Cleve, S. M. Yakusheva, V.

Format

Articles Research article

Published

2020

Series

Physical Review C

Subjects

low and intermediate energy heavy-ion reactions

ydinfysiikka

Publication in research information system

https://converis.jyu.fi/converis/portal/detail/Publication/47292353

Publisher

American Physical Society (APS)

The permanent address of the publication

https://urn.fi/URN:NBN:fi:jyu-202012086972Use this for linking

Review status

Peer reviewed

ISSN

2469-9985

DOI

https://doi.org/10.1103/physrevc.102.064602

Language

English

Published in

Physical Review C

Citation

Khuyagbaatar, J., Yakushev, A., Düllmann, C. 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., . . . Yakusheva, V. (2020). Search for elements 119 and 120. Physical Review C, 102(6), Article 064602. https://doi.org/10.1103/physrevc.102.064602

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Additional information about funding

This work was financially supported in part by the German BMBF (Grant No. 05P12UMFNE), the Helmholtz association (Grant No. VH-NG-723), the Helmholtz Institute Mainz, Swedish Research Council (Vetenskapsrådet VR Grants No. 2011-5253 and No. 2016-3969), the Australian Federal Government ARC (Grants No. DP170102318, No. DP170102423, and No. DP200100601), the US Department of Energy by LLNL (Grant No. DE-AC52-07NA27344), Vanderbilt University (Grant No. DE-FG05-88ER40407), and the Laboratory Directed Research and Development Program at LLNL (Grant No. 11-ERD-011). This work was cosponsored by the Office of Science, US Department of Energy (DOE), and supported under U.S. DOE Grant No. DE-AC05-00OR22725 (ORNL). 249Bk material was provided by the U.S. DOE Isotope Program.

Search for elements 119 and 120

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