Discovery of a new long-lived isomer in 114Rh via Penning-trap mass spectrometry
Year: 2025
Type: article
Abstract: We report on mass measurements of three long-lived states in 114 Rh performed with the JYFLTRAP Penning-trap mass spectrometer: the ground state and two isomers with estimated half-lives of about one second. The used Phase-Imaging Ion-Cyclotron-Resonance technique allowed for the discovery of a so far unknown second long-lived isomer. All three states were produced directly in proton-induced fission on a uranium target, whereas only the isomeric states were populated in the β decay of the 114 Ru ground state with spin-parity 0 + . We propose spin-parity assignments of ( 6 − ) for the ground state, and ( 3 + ) and ( 0 − ) for the isomers. They resolve the puzzle of anomalous fission yields of this isotope despite the existing literature assigning a low angular momentum to the ground state. The experimental evidence is further supported by a detailed analysis based on mean-field calculations with the BSkG3 model. As for many other nuclei in this mass region, considering triaxial shapes is decisive for the interpretation of low-lying states of this nucleus. The discovery of a new isomer in 114 Rh and our theoretical work challenge the currently adopted spin-parity assignments in this and several other odd-odd neutron-rich Rh isotopes.
Source: Physics Letters B
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Awards: G1077405606, G1276317268, G1601652784, G2001806450, G2188020438, G2236148697, G2499651546, G2757661257, G3345895242, G434337789, G4937468798, G522478768, G5745676273, G5769078035, G5923730219, G6281504974, Laser Ionization and Spectroscopy of Actinide elements, G7128194990, G7628805400, G7671084252, G7984235579, EUROpean Laboratories for Accelerator Based Science, G8512683158
OpenAlex ID: W4403407052