A1 Journal article (refereed)
Stability of the heaviest elements : K isomer in 250No (2020)

Kallunkathariyil, J., Sulignano, B., Greenlees, P. T., Khuyagbaatar, J., Theisen, Ch., 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

JYU authors or editors

Publication details

All authors or editors: Kallunkathariyil, J.; Sulignano, B.; Greenlees, P. T.; Khuyagbaatar, J.; Theisen, Ch.; Auranen, K.; Badran, H.; Bisso, F.; Brionnet, P.; Briselet, R.; et al.

Journal or series: Physical Review C

ISSN: 2469-9985

eISSN: 2469-9993

Publication year: 2020

Volume: 101

Issue number: 1

Article number: 011301(R)

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevC.101.011301

Publication open access: Not open

Publication channel open access:

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/67371

Additional information: Rapid Communication.


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.

Keywords: nuclear physics

Free keywords: isomer decays; nuclear structure and decays

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 2

Last updated on 2022-17-06 at 11:33