First observation of high-<i>K</i> isomeric states in <SUP>249</SUP>Md and <SUP>251</SUP>Md

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-<i>K</i> isomeric states in <SUP>249</SUP>Md and <SUP>251</SUP>Md. EUROPEAN PHYSICAL JOURNAL A, 57 (12). 321-.

Access the full-text of this item by clicking on the Open Access link.
[img] Text
2107.00517v1.pdf - Submitted version

Download (7MB) | Preview


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: 15 Mar 2024 07:34
DOI: 10.1140/epja/s10050-021-00631-4
Open Access URL:
Related URLs: