Search For Elements 119 And 120

J. Khuyagbaatar, A. Yakushev,Ch. E. Düllmann,D. Ackermann,L.-L. Andersson,M. Asai,M. Block, R. A. Boll,H. Brand,D. M. Cox,M. Dasgupta,X. Derkx,A. Di Nitto,K. Eberhardt,J. Even,M. Evers, C. Fahlander,U. Forsberg,J. M. Gates, N. Gharibyan, P. Golubev,K. E. Gregorich,J. H. Hamilton,W. Hartmann,R.-D. Herzberg,F. P. Heßberger,D. J. Hinde,J. Hoffmann,R. Hollinger,A. Hübner,E. Jäger, B. Kindler,J. V. Kratz, J. Krier,N. Kurz,M. Laatiaoui,S. Lahiri,R. Lang, B. Lommel,M. Maiti,K. Miernik,S. Minami,A. K. Mistry,C. Mokry, H. Nitsche,J. P. Omtvedt,G. K. Pang,P. Papadakis,D. Renisch, J. B. Roberto,D. Rudolph, J. Runke,K. P. Rykaczewski,L. G. Sarmiento, M. Schädel, B. Schausten,A. Semchenkov, D. A. Shaughnessy,P. Steinegger,J. Steiner,E. E. Tereshatov, P. Thörle-Pospiech, K. Tinschert,T. Torres De Heidenreich, N. Trautmann, A. Türler,J. Uusitalo,M. Wegrzecki, N. Wiehl, S. M. Van Cleve,V. Yakusheva

PHYSICAL REVIEW C（2020）

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摘要

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