December 2023

Journal

Search for elements 119 and 120

By:
Khuyagbaatar, J.; Yakushev, A.; Dullmann, Ch.; Ackermann, D.; Andersson, L.-L.; Asai, Makoto; Block, M.; Boll, Rose A; Brand, H.; Cox, D.; 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, David J; Hoffmann, Jan; Hollinger, Ralph ; Hubner, A; Jager, E; Kindler, B.; Kratz, J. V.; Krier, J.; Kurz, N.; Laatiaooui, M; Lahiri, S; Lang, R; Lommel, B.; Maiti, M; Miernik, Krzysztof A; Minami, S; Mistry, A.; Mokry, C.; Nitsche, H.; Omtvedt, J. P.; Pang, Gregory K; Papadakis, P.; Renisch, D; Roberto, James B; Rudolph, D.; Runke, J.; Rykaczewski, Krzysztof P; Sarmiento, L. G.; Schadel, M.; Schausten, B.; Semchenkov, A; Shaughnessy, D.; Steinegger, P; Steiner, J; Tereshatov, Evgeny ; Thorle pospiech, P; Tinschert, K; Torres, T.; Trautmann, N.; Turler, A; Uusitalo, J; Wegrzecki, M; Wiehl, N.; Cleveland, Steven L; Yakusheva, V
Journal Name:
Physical Review C
Page Number:
064602-1-064602-9
Volume:
102
Issue Number:
6
Publication Date:
December 2023
View DOI Listing:
https://doi.org/10.1103/PhysRevC.102.064602

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.

Related Researchers