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Report No.
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Fission barrier of superheavy nuclei and persistence of shell effects at high spin; Cases of $$^{254}$$No and $$^{220}$$Th

Henning, G.*; Khoo, T. L.*; Lopez-Martens, A.*; 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.*; G$"u$rdal, 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.*; Rogers, A. M.*; Rowley, N.*; Zhu, S.*

Fission barrier heights of a shell-stabilized superheavy nucleus $$^{254}$$No have been determined as a function of spin up to 19$$hbar$$ through the measured distribution of entry points of $$gamma$$ deexcitations in the excitation energy vs. spin plane. The fission barrier height of $$^{254}$$No was determined to be 6.0 MeV at spin 15$$hbar$$, and 6.6 MeV at spin 0$$hbar$$ by extrapolation. This demonstrates that the shell effect actually enlarges the fission barrier in such heavy nuclei and keeps the barrier high even at high spin.

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Category:Physics, Multidisciplinary

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