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

Summary, in English

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.

• Author: U. Forsberg; D. Rudolph; L. L. Andersson; A. Di Nitto; Ch E. Düllmann; C. Fahlander; J. M. Gates; P. Golubev; K. E. Gregorich; C. J. Gross; R. D. Herzberg; F. P. Heßberger; J. Khuyagbaatar; J. V. Kratz; K. Rykaczewski; L. G. Sarmiento; M. Schädel; A. Yakushev; Sven Åberg; D. Ackermann; M. Block; H. Brand; Gillis Carlsson; 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; I. Ragnarsson; 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
• Department/s: Nuclear physics; Mathematical Physics
• Publishing year: 2016-09-01
• Language: English
• Pages: 117-138
• Publication/Series: Nuclear Physics, Section A
• Volume: 953
• Links: http://dx.doi.org/10.1016/j.nuclphysa.2016.04.025
• Document type: Journal article
• Publisher: Elsevier
• Topic: Subatomic Physics; Natural Sciences
• Keywords: Element 115; Spontaneous fission; Superheavy elements; Uup; α decay
• Status: Published
• Project: Element 115; Nuclear Structure at the Limits: Isotope-selective Spectroscopy
• ISBN/ISSN/Other: ISSN: 0375-9474