Recoil-α-fission and recoil-α–α-fission events observed in the reaction 48Ca + 243Am

Forsberg, U.; Rudolph, D.; Andersson, L.-L.; Di Nitto, A.; Düllmann, Ch.E.; Fahlander, C.; Gates, J.M.; Golubev, P.; Gregorich, K.E.; Gross, C.J.; Herzberg, R.-D.; Heßberger, F.P.; Khuyagbaatar, J.; Kratz, J.V.; Rykaczewski, K.; Sarmiento, L.G.; Schädel, M.; Yakushev, A.; Åberg, S.; Ackermann, D.; ... (2016). Recoil-α-fission and recoil-α–α-fission events observed in the reaction 48Ca + 243Am. Nuclear Physics A, 953, pp. 117-138. Elsevier 10.1016/j.nuclphysa.2016.04.025

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Products of the fusion-evaporation reaction 48Ca + 243Am were studied with the TASISpec set-up at the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany. Amongst the detected thirty correlated α -decay chains associated with the production of element Z=115Z=115, two recoil-α -fission and five recoil-α–αα–α-fission events were observed. The latter five chains are similar to four such events reported from experiments performed at the Dubna gas-filled separator, and three such events reported from an experiment at the Berkeley gas-filled separator. The four chains observed at the Dubna gas-filled separator were assigned to start from the 2n-evaporation channel 289115 due to the fact that these recoil-α–αα–α-fission events were observed only at low excitation energies. Contrary to this interpretation, we suggest that some of these recoil-α–αα–α-fission decay chains, as well as some of the recoil-α–αα–α-fission and recoil-α-fission decay chains reported from Berkeley and in this article, start from the 3n-evaporation channel 288115.

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