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Third minima in actinides - do they exist?
We study the existence of third, hyperdeformed minima in a number of
even-even Th, U and Pu nuclei using the Woods-Saxon microscopic-macroscopic
model that very well reproduces first and second minima and fission barriers in
actinides. Deep ( MeV) minima found previously by \'Cwiok et al. are
found spurious after sufficiently general shapes are included. Shallow third
wells may exist in Th, with IIIrd barriers 200 and 330 keV
(respectively). Thus, a problem of qualitative discrepancy between
microscopic-macroscopic and selfconsistent predictions is resolved. Now, an
understanding of experimental results on the apparent third minima in uranium
becomes an issue.Comment: 5 pages, 3 figures, 02. 03. 2012 - submitted to PR
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