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Report No.

Exploring the stability of super heavy elements; First measurement of the fission barrier of $$^{254}$$No

Henning, G.*; Lopez-Martens, A.*; Khoo, T. L.*; Seweryniak, D.*; Alcorta, M.*; Asai, Masato  ; Back, B. B.*; Bertone, P. F.*; Boilley, D.*; Carpenter, M. P.*; Chiara, C. J.*; Chowdhury, P.*; Gall, B.*; Greenlees, P. T.*; Gurdal, G.*; Hauschild, K.*; Heinz, A.*; Hoffman, C. R.*; Janssens, R. V. F.*; Karpov, A. V.*; Kay, B. P.*; Kondev, F. G.*; Lakshmi, S.*; Lauritsen, T.*; Lister, C. J.*; McCutchan, E. A.*; Nair, C.*; Piot, J.*; Potterveld, D.*; Reiter, P.*; Rowley, N.*; Rogers, A. M.*; Zhu, S.*

Fission barrier heights of $$^{254}$$No have been determined through the entry distribution method. The entry distribution is the initial distribution of excitation energy and spin from which the $$gamma$$ deexcitation starts in the fusion-evaporation reaction. The initial distribution is extracted from measured $$gamma$$-ray multiplicity and total $$gamma$$-ray energy. This paper describes the details of the entry distribution method, and reports the first determination of the fission barrier heights of $$^{254}$$No, which is the heaviest nucleus whose fission barrier has been measured.



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