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Fission Barrier of Superheavy Nuclei and Persistence of Shell Effects at High Spin: Cases of No-254 and Th-220

G. Henning ; T. L. Khoo ; A. Lopez-Martens ; D. Seweryniak ; M. Alcorta ; M. Asai ; B. B. Back ; P. F. Bertone ; D. Boilley ; M. P. Carpenter ; C. J. Chiara ; P. Chowdhury ; B. Gall ; P. T. Greenlees ; G. Gurdal ; K. Hauschild ; Andreas Martin Heinz (Institutionen för fundamental fysik) ; C. R. Hoffman ; R. V. F. Janssens ; A. V. Karpov ; B. P. Kay ; F. G. Kondev ; S. Lakshmi ; T. Lauritsen ; C. J. Lister ; E. A. McCutchan ; C. Nair ; J. Piot ; D. Potterveld ; P. Reiter ; A. M. Rogers ; N. Rowley ; S. Zhu
Physical Review Letters (0031-9007). Vol. 113 (2014), 26,
[Artikel, refereegranskad vetenskaplig]

We report on the first measurement of the fission barrier height in a heavy shell-stabilized nucleus. The fission barrier height of No-254 is measured to be B-f = 6.0 +/- 0.5 MeV at spin 15 (h) over bar and, by extrapolation, B-f = 6.6 +/- 0.9 MeV at spin 0 (h) over bar. This information is deduced from the measured distribution of entry points in the excitation energy versus spin plane. The same measurement is performed for Th-220 and only a lower limit of the fission barrier height can be determined: B-f (I) > 8 MeV. Comparisons with theoretical fission barriers test theories that predict properties of superheavy elements.

Denna post skapades 2015-02-25. Senast ändrad 2015-03-30.
CPL Pubid: 213132


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Institutionen för fundamental fysik (2005-2015)



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