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Search for elements 119 and 120

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Search for elements 119 and 120

https://jyx.jyu.fi/handle/123456789/73027
http://www.urn.fi/URN:NBN:fi:jyu-202012086972
khuyagbaatarym0812.pdf (Jyväskylän yliopisto - JYX)
Artikkeli
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. ; Fysiikan laitos ; Department of Physics ; Kiihdytinlaboratorio ; Accelerator Laboratory
American Physical Society (APS) 2020
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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.

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