Elucidating the nature of the proton radioactivity and branching ratio on the first proton emitter discovered 53mCo
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Published:2023-09-25
Issue:1
Volume:14
Page:
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ISSN:2041-1723
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Container-title:Nature Communications
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language:en
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Short-container-title:Nat Commun
Author:
Sarmiento Luis G.ORCID, Roger ThomasORCID, Giovinazzo JérômeORCID, Brown B. Alex, Blank BertramORCID, Rudolph DirkORCID, Kankainen AnuORCID, Alvarez-Pol HéctorORCID, Raj Alex Arokia, Ascher PaulineORCID, Block MichaelORCID, Caamaño-Fresco ManuelORCID, Caceres Lucia, Canete LaetitiaORCID, Cox Daniel M., Eronen TommiORCID, Fahlander Claes, Fernández-Domínguez BeatrizORCID, Forsberg Ulrika, Lois-Fuentes Juan, Gerbaux MathiasORCID, Gerl JürgenORCID, Golubev Pavel, Grévy StéphaneORCID, Grinyer Gwen F.ORCID, Habermann Tobias, Hakala Jani, Jokinen Ari, Kamalou Omar, Kojouharov Ivan, Kolhinen Veli S., Koponen Jukka, Kurz NikolausORCID, Lalović NatašaORCID, Lorenz Christian, Mauss Benoit, Mentana Alice, Moore Iain D.ORCID, Ortega Moral Aurora, Pancin Julien, Papadakis PhilipposORCID, Pibernat Jérôme, Piot JulienORCID, Pohjalainen IlkkaORCID, Reinikainen Juuso, Rinta-Antila SamiORCID, Schaffner Henning, Sorlin Olivier, Stodel Christelle, Thomas Jean-CharlesORCID, Versteegen MaudORCID, Voss Annika
Abstract
AbstractThe 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, $${{{{{{\mathcal{l}}}}}}}_{{{{{{\rm{p}}}}}}}=9$$
l
p
=
9
and $${{{{{{\mathcal{l}}}}}}}_{{{{{{\rm{p}}}}}}}=7$$
l
p
=
7
, 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.
Publisher
Springer Science and Business Media LLC
Subject
General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry,Multidisciplinary
Reference48 articles.
1. Jackson, K. P., Cardinal, C. U., Evans, H. C., Jelley, N. A. & Cerny, J. 53Com: A proton-unstable isomer. Phys. Lett. B 33, 281 (1970). 2. Cerny, J., Esterl, J. E., Gough, R. A. & Sextro, R. G. Confirmed proton radioactivity of 53Com. Phys. Lett. B 33, 284 (1970). 3. Jänecke, J. The emission of protons from light neutron-deficient nuclei. Nucl. Phys. 61, 326 (1965). 4. Goldanskii, V. I. Modes of radioactive decay involving proton emission. Annu Rev. Nucl. Sci. 16, 1 (1966). 5. Pfützner, M., Karny, M., Grigorenko, L. V. & Riisager, K. Radioactive decays at limits of nuclear stability. Rev. Mod. Phys. 84, 567 (2012).
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