Stability of the heaviest elements : K isomer in 250No
Kallunkathariyil, J., Sulignano, B., Greenlees, P. T., Khuyagbaatar, J., Theisen, C., Auranen, K., Badran, H., Bisso, F., Brionnet, P., Briselet, R., Drouart, A., Favier, Z., Goigoux, T., Grahn, T., Hauschild, K., Herzan, A., Heßberger, F. P., Jakobsson, U., Julin, R., . . . Zielińska, M. (2020). Stability of the heaviest elements : K isomer in 250No. Physical Review C, 101(1), Article 011301(R). https://doi.org/10.1103/PhysRevC.101.011301
Published inPhysical Review C
Ward, A. |
DisciplineYdin- ja kiihdytinfysiikan huippuyksikköFysiikkaCentre of Excellence in Nuclear and Accelerator Based PhysicsPhysics
© 2020 American Physical Society
Decay spectroscopy of 250No has been performed using digital electronics and pulse-shape analysis of the fast nuclear decays for the first time. Previous studies of 250No reported two distinct fission decay lifetimes, related to the direct fission of the ground state and to the decay of an isomeric state but without the possibility to determine if the isomeric state decayed directly via fission or via internal electromagnetic transitions to the ground state. The data obtained in the current experiment allowed the puzzle to finally be resolved, attributing the shorter half-life of t1/2 = 3.8 ± 0.3 μs to the ground state and the longer half-life t1/2 = 34.9+3.9 −3.2 μs to the decay of an isomeric state. 250No becomes, thus, one of a very few examples of very heavy nuclei with an isomeric state living considerably longer than its ground state. This phenomenon has important consequences for the nuclear-structure models aiming to determine the borders of the island of stability of superheavy elements. ...
PublisherAmerican Physical Society
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Additional information about fundingThis work has been supported by the Academy of Finland under the Finnish Centre of Excellence Program No. (2012-2017). Support has also been provided by the EU 7th Framework Program Project No. 262010 (ENSAR).
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