Heavy-element fission barriers

Fission barriers and probabilities of spontaneous fission for elements with Z≥ 100

“…Surprisingly the modern version of the MM calculation presented in Ref. [35] (including nonaxiall shapes) gives values comparable to axially-symmetrical calculations of SHF and overestimate the experimental barriers in a similar way. This tendency is visible, to a lesser extent, also for heavier systems.…”

“…sion barriers B f for even-even isotopes of Z = 112, 114 and 120: from the WS model [32], the macroscopic-microscopic Finite Range Liquid Drop Model (FRLDM) [35], HFB calculations with the SkM* interaction [25] and the RMF model with NL3 parametrisation [36]. Results of rather comprehensive calculations were selected: all were made for dozens of nuclei and included important triaxial and mass-asymmetric deformations.…”

“…In Table 1 we collect some of the theoretical predictions of fission barrier heights based on the FRLDM [35], SHF -self consistent Hartre-Fock method [82] with the SLy6 Skyrme interaction [83] and the Extended Thomas-Fermi plus Strutinsky Integral model (ETFSI) based on Skyrme SkSC4 functional [84] in relation to experimental ones [85] and our predictions in a MM and SHFB(SkM*) models. Note that the lower limits for the fission barrier heights are evaluated in Ref.…”

Cluster formations in deformed states forSi28andS32Ichikawa1, Kanada-En’yo2, Möller3 2011Phys. Rev. CSelf Cite299730View full textAdd to dashboardCite

“…In the study here we apply for the first time the macroscopicmicroscopic model, so successful in the description of fusion and fission reactions in heavy-mass systems [17,[29][30][31][32], to very light nuclei. The model allows us to describe both onecenter deformed and two-center cluster-like configurations with mass asymmetry within the same model framework.…”

On the possibility of enhanced fission stability for broken-pair excitations

“…However, for large deformations (β 2 > 0.5) it is the β 3 degree of freedom that must be accounted for [26], and the effect is shown by the dashed line. The final barrier heights are given in Table I, which includes the ground-state fission barriers from Möller et al [15] for comparison. It should be pointed out that the 256 Fm configuration-constrained PESs were calculated earlier [4] but without consideration of the β 3 degree of freedom.…”