Published for the American Physical Society by the American Institute of Physics
Physical Review C, Nuclear Physics vol:86 issue:1
The recently measured probabilities of the β-delayed fission for 178,180Tl are used to deduce the fission-barrier
heights of the daughter isotopes 178,180Hg, undergoing low-energy fission. Four alternative β-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 180Hg. 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 β-delayed fission of 178Tl. The spread in extracted
fission-barrier heights results mainly from uncertainties in the magnitude of the pairing gap at the saddle configuration.