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Report No.
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Search for elements 119 and 120

Khuyagbaatar, J.*; Yakushev, A.*; D$"u$llmann, Ch. E.*; Ackermann, D.*; Andersson, L.-L.*; Asai, Masato  ; 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.*; He${ss}$berger, F. P.*; Hinde, D. J.*; Hoffmann, J.*; Hollinger, R.*; H$"u$bner, A.*; J$"a$ger, E.*; Kindler, B.*; Kratz, J. V.*; Krier, J.*; Kurz, N.*; Laatiaoui, M.*; Lahiri, S.*; Lang, R.*; Lommel, B.*; Maiti, M.*; Miernik, K.*; Minami, Shizu*; 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.*; Sch$"a$del, M.*; Schausten, B.*; Semchenkov, A.*; Shaughnessy, D. A.*; Steinegger, P.*; Steiner, J.*; Tereshatov, E. E.*; Th$"o$rle-Pospiech, P.*; Tinschert, K.*; Torres De Heidenreich, T.*; Trautmann, N.*; T$"u$rler, A.*; Uusitalo, J.*; Wegrzecki, M.*; Wiehl, N.*; Van Cleve, S. M.*; Yakusheva, V.*

A search for production of the superheavy elements with atomic numbers 119 and 120 was performed in the $$^{50}$$Ti+$$^{249}$$Bk and $$^{50}$$Ti+$$^{249}$$Cf fusion-evaporation reactions, respectively, at the gas-filled recoil separator TASCA. Over four months of irradiation, neither was detected at cross-section sensitivity levels of 65 and 200 fb, respectively. The non-observation 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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Percentile:97.96

Category:Physics, Nuclear

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