First observation of high-K isomeric states in $$^{249}$$ 249 Md and $$^{251}$$ 251 Md
The European Physical Journal A(2021)
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
$$\ge 910$$
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
$$\ge 844$$
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.
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Key words
isomeric states,$$^{249}$$md
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