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Search for inverse fission of uranium

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  • Background: There is a long-term interest in running the fission reaction backward, i.e., studying the "inverse fission" of uranium. The recent availability of beams of n-rich fission fragments has stimulated interest in this endeavor. Purpose: To search for inverse fission in the reactions Sn-¹²⁴,Sn-¹3² + Mo-¹⁰⁰. Method: In the Sn-¹²⁴ + Mo-¹⁰⁰ reaction, evaporation residues were searched for using in-beam detection of evaporation residues, in-beam alpha spectroscopy, and post-irradiation alpha spectroscopy, while in the Sn-¹³² + Mo-¹⁰⁰ reaction, the evaporation residue U-²³⁰ was searched for using post-irradiation alpha spectroscopy. Results: No evidence for the occurrence of the inverse fission reactions was found. The upper-limit cross section for the latter reaction is similar to ~550 µb, while the experimental upper-limit cross section for the former reaction is about 21[subscript -21][superscript +38] nb. Conclusions: The intensity of suitable radioactive beams is not high enough at present to detect inverse fission. For the Sn-¹²⁴ + Mo-1¹⁰⁰ reaction, the observed upper limits are below the estimates of current models for these reactions, probably due to fusion hindrance
  • KEYWORDS: Evaporation, Level density, Quasi fission, Complete fusion, Nuclear systems, Model, Collisions, Hindrance, Heavy ion reactions
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  • Yanez, R., Loveland, W., Beckerman, J., Leonard, M., Gross, C., Shapira, D., . . . . (2012). Search for inverse fission of uranium. Physical Review C, 85(4) doi: 10.1103/PhysRevC.85.044620
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  • 85
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  • 4
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  • This work was supported in part by the Office of High Energy and Nuclear Physics, Nuclear Physics Division, US Department of Energy, under Grant No.DE-FG06-97ER41026 and Contract No. DE-AC02-06CH11357.
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