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• W1978701412 abstract "Background: Recent experiments on $ensuremath{beta}$-delayed fission reported an asymmetric mass yield in the neutron-deficient nucleus $^{180}mathrm{Hg}$. Earlier experiments in the mass region $A=190--200$ close to the $ensuremath{beta}$-stability line, using the $(p,f)$ and $(ensuremath{alpha},f)$ reactions, observed a more symmetric distribution of fission fragments. While the $ensuremath{beta}$-delayed fission of $^{180}mathrm{Hg}$ can be associated with relatively low excitation energy, this is not the case for light-ion reactions, which result in warm compound nuclei. The low-energy fission of $^{180,198}mathrm{Hg}$ has been successfully described by theory in terms of strong shell effects in pre-scission configurations associated with dinuclear structures.Purpose: To elucidate the roles of proton and neutron numbers and excitation energy in determining symmetric- and asymmetric-fission yields, we compute and analyze the isentropic potential energy surfaces of ${}^{174,180,198}mathrm{Hg}$ and $^{196,210}mathrm{Po}$.Methods: We use the finite-temperature superfluid nuclear density functional theory for excitation energies up to ${E}^{*}=30$ MeV and zero angular momentum. For our theoretical framework, we consider the Skyrme energy density functional ${mathrm{SkM}}^{*}$ and a density-dependent pairing interaction.Results: For $^{174,180}mathrm{Hg}$, we predict fission pathways consistent with asymmetric fission at low excitation energies, with the symmetric-fission pathway opening very gradually as excitation energy is increased. For $^{198}mathrm{Hg}$ and $^{196}mathrm{Po}$, we expect the nearly symmetric-fission channel to dominate. $^{210}mathrm{Po}$ shows a preference for a slightly asymmetric pathway at low energies, and a preference for a symmetric pathway at high energies.Conclusions: Our self-consistent theory suggests that excitation energy weakly affects the fission pattern of the nuclei considered. The transition from the asymmetric fission in the proton-rich nuclei to a more symmetric fission in the heavier isotopes is governed by the shell structure of pre-scission configurations." @default.
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• W1978701412 date "2014-08-29" @default.
• W1978701412 modified "2023-10-17" @default.
• W1978701412 title "Excitation-energy dependence of fission in the mercury region" @default.
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• W1978701412 doi "https://doi.org/10.1103/physrevc.90.021302" @default.
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