Probing the Shell Effects on Fission: The New Superheavy Nucleus
Open Access
- 11 June 2025
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 134 (23) , 232501
Abstract
Decay properties of the neutron-deficient Sg isotopes were studied at the gas-filled recoil separator TASCA at GSI, Darmstadt by using the Cr 52 + Pb 206 , 208 reactions. We report on the discovery of the new isotope Sg 257 . Its ground state, tentatively assigned to have 9 / 2 − [734] configuration, was observed to decay by both spontaneous fission and α -particle emission with a half-life of 12.6 − 2.3 + 3.7 ms . The alpha decay from this high-spin state was followed by fission of Rf 253 after 11 μ s . In Sg 259 , we observed strong evidence for the occurrence of a K -isomeric state for the first time in superheavy nuclei with 106 protons. The current experimental findings, discussed within the experimental systematics and theory, indicate that hitherto unseen features of the shell effect on the fission process may be found in the neutron-deficient superheavy nuclei. Published by the American Physical Society 2025Keywords
Funding Information
- GSI Helmholtzzentrum für Schwerionenforschung
- Bundesministerium für Forschung, Technologie und Raumfahrt (05P21UMFN2)
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