Elucidating the nature of the proton radioactivity and branching ratio on the first proton emitter discovered ^53mCo.

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Sarmiento, Luis G ORCID: 0000-0001-7600-2772, Roger, Thomas ORCID: 0000-0003-4646-5076, Giovinazzo, Jérôme ORCID: 0000-0001-7436-8877, Brown, B Alex, Blank, Bertram ORCID: 0000-0001-8050-6850, Rudolph, Dirk ORCID: 0000-0003-1199-3055, Kankainen, Anu ORCID: 0000-0003-1082-7602, Alvarez-Pol, Héctor ORCID: 0000-0001-9643-6252, Raj, Alex Arokia, Ascher, Pauline ORCID: 0000-0002-1990-0848 et al (show 42 more authors) , Block, Michael ORCID: 0000-0001-9282-8347, Caamaño-Fresco, Manuel ORCID: 0000-0002-5045-003X, Caceres, Lucia, Canete, Laetitia ORCID: 0000-0002-4229-6386, Cox, Daniel M, Eronen, Tommi ORCID: 0000-0003-0003-6022, Fahlander, Claes, Fernández-Domínguez, Beatriz ORCID: 0000-0001-7859-2438, Forsberg, Ulrika, Lois-Fuentes, Juan, Gerbaux, Mathias ORCID: 0000-0002-3852-2643, Gerl, Jürgen ORCID: 0000-0001-5538-0563, Golubev, Pavel, Grévy, Stéphane ORCID: 0000-0003-2680-1802, Grinyer, Gwen F ORCID: 0000-0001-6407-7064, Habermann, Tobias, Hakala, Jani, Jokinen, Ari, Kamalou, Omar, Kojouharov, Ivan, Kolhinen, Veli S, Koponen, Jukka, Kurz, Nikolaus ORCID: 0000-0001-5128-3491, Lalović, Nataša ORCID: 0000-0003-0643-9615, Lorenz, Christian, Mauss, Benoit, Mentana, Alice ORCID: 0000-0001-5370-0308, Moore, Iain D ORCID: 0000-0003-0934-8727, Ortega Moral, Aurora, Pancin, Julien, Papadakis, Philippos ORCID: 0000-0001-7509-4257, Pibernat, Jérôme, Piot, Julien ORCID: 0000-0002-6593-6964, Pohjalainen, Ilkka ORCID: 0000-0003-4047-8757, Reinikainen, Juuso, Rinta-Antila, Sami ORCID: 0000-0003-4198-1960, Schaffner, Henning, Sorlin, Olivier, Stodel, Christelle, Thomas, Jean-Charles ORCID: 0000-0001-6618-9772, Versteegen, Maud ORCID: 0000-0002-5062-2882 and Voss, Annika (2023) Elucidating the nature of the proton radioactivity and branching ratio on the first proton emitter discovered ^53mCo. Nature communications, 14 (1). 5961-.

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Abstract

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, [Formula: see text] and [Formula: see text], 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 b_p1 = 1.3(1)% and b_p2 = 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.

Item Type:	Article
Divisions:	Faculty of Science and Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	10 Nov 2023 15:40
Last Modified:	10 Nov 2023 15:40
DOI:	10.1038/s41467-023-39389-2
Open Access URL:	https://doi.org/10.1038/s41467-023-39389-2
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3176727