Goigoux, T, Theisen, Ch, Sulignano, B, Airiau, M, Auranen, K, Badran, H, Briselet, R, Calverley, T, Cox, D, Dechery, F et al (show 38 more authors)
(2021)
First observation of high-K isomeric states in Md-249 and Md-251.
EUROPEAN PHYSICAL JOURNAL A, 57 (12).
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2107.00517v1.pdf - Submitted version Download (7MB) | Preview |
Abstract
Decay spectroscopy of the odd-proton nuclei $^{249}$Md and $^{251}$Md 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 $\geq 910$ keV was found in $^{249}$Md. In $^{251}$Md, an isomeric state with a half-life of $1.4(3)$ s and an excitation energy $\geq 844$ keV was found. Similarly to the neighbouring $^{255}$Lr, 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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | nucl-ex, nucl-ex, nucl-th |
| Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 12 Jul 2021 09:49 |
| Last Modified: | 18 Jan 2023 21:36 |
| DOI: | 10.1140/epja/s10050-021-00631-4 |
| Open Access URL: | https://arxiv.org/pdf/2107.00517.pdf |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3129746 |
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