Hindered alpha decays of heaviest high-K isomers

Abstract

To find candidates for long-lived high-K isomers in even-even Z=106-112 superheavy nuclei we study dominant alpha-decay channel of two- and four-quasi-particle configurations at a low excitation. Energies are calculated within the microscopic - macroscopic approach with the deformed Woods-Saxon potential. Configurations are fixed by a standard blocking procedure and their energy found by a subsequent minimization over deformations. Different excitation energies of a high-K configuration in parent and daughter nucleus seem particularly important for a hindrance of the alpha-decay. A strong hindrance is found for some four-quasi-particle states, particularly $K^{\pi }=20^{+}$ and/or $19^{+}$ states in ${}^{264-270}$Ds. Contrary to what was suggested in experimental papers, it is rather a proton configuration that leads to this strong hindrance. If not shortened by the electromagnetic decay, alpha half-lives of $\sim$ 1 s could open new possibilities for studies of chemical/atomic properties of related elements.

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Cited by in corpus (5)

• Recent developments in radioactive charged-particle emissions and related phenomena
• Properties of heaviest nuclei with $98\le Z\le 126$ and $134\le N\le 192$
• First investigation on the isomeric ratio in multinucleon transfer reactions: Entrance channel effects on the spin distribution
• $K$-isomeric states in the isotopic and isotonic chains of ${}^{178}$Hf
• First observation of high-$K$ isomeric states in ${}^{249}$Md and ${}^{251}$Md