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

• Published in: Nuclear physics. A Vol. 953; no. C; pp. 117 - 138
• Main Authors: 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., Block, M., Brand, H., Carlsson, B.G., Cox, D., Derkx, X., Dobaczewski, J., Eberhardt, K., Even, J., Gerl, J., Jäger, E., Kindler, B., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Nazarewicz, W., Nitsche, H., Omtvedt, J.P., Papadakis, P., Ragnarsson, I., Runke, J., Schaffner, H., Schausten, B., Shi, Yue, Thörle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Türler, A., Ward, A., Ward, D.E., Wiehl, N.
• Format: Journal Article
• Language: English
• Published: United States Elsevier B.V 01-09-2016; Elsevier
• Subjects: Element 115; Fysik; Natural Sciences; Naturvetenskap; NUCLEAR PHYSICS AND RADIATION PHYSICS; Physical Sciences; Spontaneous fission; Subatomic Physics; Subatomär fysik; Superheavy elements; Uup; α decay; Uup; Superheavy elements; Spontaneous fission; Element 115; α decay
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2016.04.025

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=115, two recoil-α-fission and five recoil-α–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–α-fission events were observed only at low excitation energies. Contrary to this interpretation, we suggest that some of these recoil-α–α-fission decay chains, as well as some of the recoil-α–α-fission and recoil-α-fission decay chains reported from Berkeley and in this article, start from the 3n-evaporation channel 288115.