Fission-barrier heights of neutron-deficient mercury nuclei

中性子欠損した水銀原子核の核分裂障壁の高さ

Veselsk, M.*; Andreyev, A. N.*; Antalic, S.*; Huyse, M.*; Mller, P.*; 西尾 勝久   ; Sierk, A. J.*; Van Duppen, P.*; Venhart, M.*

Veselsk, M.*; Andreyev, A. N.*; Antalic, S.*; Huyse, M.*; Mller, P.*; Nishio, Katsuhisa; Sierk, A. J.*; Van Duppen, P.*; Venhart, M.*

The recently measured probabilities of the beta-delayed fission for Tl are used to deduce the fission-barrier heights of the daughter isotopes Hg, undergoing low-energy fission. Four alternative -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 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 -delayed fission of Tl. The spread in extracted fission barrier heights results mainly from uncertainties in the magnitude of the pairing gap at the saddle configuration.