RT Journal Article
T1 Elucidating the nature of the proton radioactivity and branching ratio on the first proton emitter discovered 53mCo
A1 Sarmiento, Luis G.
A1 Álvarez Pol, Héctor
A1 Caamaño Fresco, Manuel
A1 Fernández Domínguez, Beatriz
A1 Lois-Fuentes, Juan
A1 Voss, Annika
K1 Protons
K1 Radioactivity
K1 TPC
AB The observation of a weak proton-emission branch in the decay of the 3174-keV 53mCo isomeric state marked the discovery of proton radioactivity in atomic nuclei in 1970. Here we show, based on the partial half-lives and the decay energies of the possible proton-emission branches, that the exceptionally high angular momentum barriers, 𝓁  and 𝓁, play a key role in hindering the proton radioactivity from 53mCo, making them very challenging to observe and calculate. Indeed, experiments had to wait decades for significant advances in accelerator facilities and multi-faceted state-of-the-art decay stations to gain full access to all observables. Combining data taken with the TASISpec decay station at the Accelerator Laboratory of the University of Jyväskylä, Finland, and the ACTAR TPC device on LISE3 at GANIL, France, we measured their branching ratios as bp1 = 1.3(1)% and bp2 = 0.025(4)%. These results were compared to cutting-edge shell-model and barrier penetration calculations. This description reproduces the order of magnitude of the branching ratios and partial half-lives, despite their very small spectroscopic factors.
PB Nature
YR 2023
FD 2023-09-25
LK https://hdl.handle.net/10347/39319
UL https://hdl.handle.net/10347/39319
LA eng
NO Sarmiento, L.G., Roger, T., Giovinazzo, J. et al. Elucidating the nature of the proton radioactivity and branching ratio on the first proton emitter discovered 53mCo. Nat Commun 14, 5961 (2023). https://doi.org/10.1038/s41467-023-39389-2
DS Minerva
RD 24 abr 2026