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Report No.

Fission-barrier heights of neutron-deficient mercury nuclei

Veselsk$'y$, M.*; Andreyev, A. N.*; Antalic, S.*; Huyse, M.*; M$"o$ller, P.*; Nishio, Katsuhisa   ; Sierk, A. J.*; Van Duppen, P.*; Venhart, M.*

The recently measured probabilities of the beta-delayed fission for $$^{178,180}$$Tl are used to deduce the fission-barrier heights of the daughter isotopes $$^{178,180}$$Hg, undergoing low-energy fission. Four alternative $$beta$$-decay strength functions and four variants of the statistical model of de-excitation of the daughter nucleus are used to determine the fission-barrier height for $$^{180}$$Hg. Depending on the choice of the model, the deduced fission-barrier heights appear to be between 10 and 40% smaller than theoretical estimates. This observation is verified also for fission-barrier heights extracted using the probability of $$beta$$-delayed fission of $$^{178}$$Tl. The spread in extracted fission barrier heights results mainly from uncertainties in the magnitude of the pairing gap at the saddle configuration.



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Category:Physics, Nuclear



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