Search for elements 119 and 120
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Khuyagbaatar, J.
Yakushev, A.
Dullmann, Ch.E.
Ackermann, D.
Andersson, L.-L
Asai, M.
Block, M.
Boll, R.A.
Brand, H.
Cox, D M
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American Physical Society
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 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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Physical Review C
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Open Access
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