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

Research output: Contribution to journalArticle


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.


  • L. L. Andersson
  • A. Di Nitto
  • Ch E. Düllmann
  • J. M. Gates
  • K. E. Gregorich
  • C. J. Gross
  • R. D. Herzberg
  • F. P. Heßberger
  • J. Khuyagbaatar
  • J. V. Kratz
  • K. Rykaczewski
  • M. Schädel
  • A. Yakushev
  • D. Ackermann
  • M. Block
  • H. Brand
  • D. Cox
  • X. Derkx
  • J. Dobaczewski
  • K. Eberhardt
  • J. Even
  • J. Gerl
  • E. Jäger
  • B. Kindler
  • J. Krier
  • I. Kojouharov
  • N. Kurz
  • B. Lommel
  • A. Mistry
  • C. Mokry
  • W. Nazarewicz
  • H. Nitsche
  • J. P. Omtvedt
  • P. Papadakis
  • J. Runke
  • H. Schaffner
  • B. Schausten
  • Yue Shi
  • P. Thörle-Pospiech
  • T. Torres
  • T. Traut
  • N. Trautmann
  • A. Türler
  • A. Ward
  • D. E. Ward
  • N. Wiehl
External organisations
  • Helmholtz Institute Mainz
  • University of Mainz
  • GSI Helmholtz Centre for Heavy Ion Research
  • Lawrence Berkeley National Laboratory
  • Oak Ridge National Laboratory
  • University of Liverpool
  • Japan Atomic Energy Agency
  • University of York
  • University of Groningen
  • Michigan State University
  • University of Oslo
  • University of Jyväskylä
  • Paul Scherrer Institute
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
  • Natural Sciences


  • Element 115, Spontaneous fission, Superheavy elements, Uup, α decay
Original languageEnglish
Pages (from-to)117-138
Number of pages22
JournalNuclear Physics, Section A
Early online date2016 May
Publication statusPublished - 2016 Sep 1
Publication categoryResearch

Related research output

Ulrika Forsberg, Claes Fahlander & Dirk Rudolph, 2016 Dec 1, Nobel Symposium NS 160 – Chemistry and Physics of Heavy and Superheavy Elements: EPJ Web of Conferences. Rudolph, D. (ed.). EDP Sciences, Vol. 131. 7 p. 02003

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

Dirk Rudolph (ed.), 2016 Dec 1, EDP Sciences. 310 p.

Research output: Book/ReportConference proceeding (editor)

Gates, J. M., Gregorich, K. E., Gothe, O. R., Uribe, E. C., Pang, G. K., Bleuel, D. L., Block, M., Clark, R. M., Campbell, C. M., Crawford, H. L., Cromaz, M., Di Nitto, A., Düllmann, C. E., Esker, N. E., Fahlander, C., Fallon, P., Farjadi, R. M., Forsberg, U., Khuyagbaatar, J., Loveland, W. & 13 othersMacchiavelli, A. O., May, E. M., Mudder, P. R., Olive, D. T., Rice, A. C., Rissanen, J., Dirk Rudolph, Luis Sarmiento, Shusterman, J. A., Stoyer, M. A., Wiens, A., Yakushev, A. & Nitsche, H., 2015, In : Physical Review C (Nuclear Physics). 92, 2, 6 p., 021301.

Research output: Contribution to journalArticle

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Related projects

Ulrika Forsberg, Dirk Rudolph, Pavel Golubev & Claes Fahlander


Project: Dissertation

Dirk Rudolph, Claes Fahlander, Pavel Golubev, Luis Sarmiento Pico, Anton Såmark-Roth, Daniel Cox, Ulrika Forsberg, Christian Lorenz, Natasa Lalovic, Natasa Lalovic, Ulrika Forsberg, Jnaneswari Gellanki, Robert Hoischen, Emma Johansson, Lise-Lotte Andersson, Rickard du Rietz, Jörgen Ekman & Corina Andreoiu

Kungliga Fysiografiska Sällskapet i Lund, Swedish Research Council


Project: Research

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Related activities

Rudolph, D. (Invited speaker)
2019 Aug 30

Activity: Talk or presentationInvited talk

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