A1 Journal article (refereed)
First observation of high-K isomeric states in 249Md and 251Md (2021)

Goigoux, T., Theisen, Ch., Sulignano, B., Airiau, M., Auranen, K., Badran, H., Briselet, R., Calverley, T., Cox, D., Déchery, F., Defranchi Bisso, F., Drouart, A., Favier, Z., Gall, B., Grahn, T., Greenlees, P. T., Hauschild, K., Herzáň, A., Herzberg, R.-D., . . . Skalski, J. (2021). First observation of high-K isomeric states in 249Md and 251Md. European Physical Journal A, 57(12), Article 321. https://doi.org/10.1140/epja/s10050-021-00631-4

JYU authors or editors

Publication details

All authors or editors: Goigoux, T.; Theisen, Ch.; Sulignano, B.; Airiau, M.; Auranen, K.; Badran, H.; Briselet, R.; Calverley, T.; Cox, D.; Déchery, F.; et al.

Journal or series: European Physical Journal A

ISSN: 1434-6001

eISSN: 1434-601X

Publication year: 2021

Volume: 57

Issue number: 12

Article number: 321

Publisher: Springer Science and Business Media LLC

Publication country: Germany

Publication language: English

DOI: https://doi.org/10.1140/epja/s10050-021-00631-4

Publication open access: Not open

Publication channel open access: 

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/79260

Publication is parallel published: https://arxiv.org/abs/2107.00517

Abstract

Decay spectroscopy of the odd-proton nuclei 249Md and 251Md has been performed. High-K isomeric states were identified for the first time in these two nuclei through the measurement of their electromagnetic decay. An isomeric state with a half-life of 2.8(5) ms and an excitation energy ≥910 keV was found in 249Md. In 251Md, an isomeric state with a half-life of 1.4(3) s and an excitation energy ≥844 keV was found. Similarly to the neighbouring 255Lr, these two isomeric states are interpreted as 3 quasi-particle high-K states and compared to new theoretical calculations. Excited nuclear configurations were calculated within two scenarios: via blocking nuclear states located in proximity to the Fermi surface or/and using the quasiparticle Bardeen–Cooper–Schrieffer method. Relevant states were selected on the basis of the microscopic-macroscopic model with a deformed Woods–Saxon potential. The most probable candidates for the configurations of K-isomeric states in Md nuclei are proposed.

Keywords: nuclear physics; isomerism; half life

Contributing organizations

Ministry reporting: Yes

VIRTA submission year: 2021

JUFO rating: 1