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

Luis G. Sarmiento (), Thomas Roger, Jérôme Giovinazzo, B. Alex Brown, Bertram Blank, Dirk Rudolph, Anu Kankainen, Héctor Alvarez-Pol, Alex Arokia Raj, Pauline Ascher, Michael Block, Manuel Caamaño-Fresco, Lucia Caceres, Laetitia Canete, Daniel M. Cox, Tommi Eronen, Claes Fahlander, Beatriz Fernández-Domínguez, Ulrika Forsberg, Juan Lois-Fuentes, Mathias Gerbaux, Jürgen Gerl, Pavel Golubev, Stéphane Grévy, Gwen F. Grinyer, Tobias Habermann, Jani Hakala, Ari Jokinen, Omar Kamalou, Ivan Kojouharov, Veli S. Kolhinen, Jukka Koponen, Nikolaus Kurz, Nataša Lalović, Christian Lorenz, Benoit Mauss, Alice Mentana, Iain D. Moore, Aurora Ortega Moral, Julien Pancin, Philippos Papadakis, Jérôme Pibernat, Julien Piot, Ilkka Pohjalainen, Juuso Reinikainen, Sami Rinta-Antila, Henning Schaffner, Olivier Sorlin, Christelle Stodel, Jean-Charles Thomas, Maud Versteegen and Annika Voss
Additional contact information
Luis G. Sarmiento: Lund University
Thomas Roger: Grand Accélérateur National d’Ions Lourds, CEA/DRF-CNRS/IN2P3, B.P. 55027
Jérôme Giovinazzo: Laboratoire de Physique des Deux Infinis de Bordeaux, UMR 5797 CNRS/IN2P3—Université de Bordeaux
B. Alex Brown: Michigan State University
Bertram Blank: Laboratoire de Physique des Deux Infinis de Bordeaux, UMR 5797 CNRS/IN2P3—Université de Bordeaux
Dirk Rudolph: Lund University
Anu Kankainen: University of Jyväskylä
Héctor Alvarez-Pol: IGFAE - Universidade de Santiago de Compostela
Alex Arokia Raj: Instituut voor Kern- en Stralingsfysica, KU Leuven
Pauline Ascher: Laboratoire de Physique des Deux Infinis de Bordeaux, UMR 5797 CNRS/IN2P3—Université de Bordeaux
Michael Block: GSI Helmholtzzentrum für Schwerionenforschung GmbH
Manuel Caamaño-Fresco: IGFAE - Universidade de Santiago de Compostela
Lucia Caceres: Grand Accélérateur National d’Ions Lourds, CEA/DRF-CNRS/IN2P3, B.P. 55027
Laetitia Canete: University of Jyväskylä
Daniel M. Cox: Lund University
Tommi Eronen: University of Jyväskylä
Claes Fahlander: Lund University
Beatriz Fernández-Domínguez: IGFAE - Universidade de Santiago de Compostela
Ulrika Forsberg: Lund University
Juan Lois-Fuentes: IGFAE - Universidade de Santiago de Compostela
Mathias Gerbaux: Laboratoire de Physique des Deux Infinis de Bordeaux, UMR 5797 CNRS/IN2P3—Université de Bordeaux
Jürgen Gerl: GSI Helmholtzzentrum für Schwerionenforschung GmbH
Pavel Golubev: Lund University
Stéphane Grévy: Laboratoire de Physique des Deux Infinis de Bordeaux, UMR 5797 CNRS/IN2P3—Université de Bordeaux
Gwen F. Grinyer: University of Regina
Tobias Habermann: GSI Helmholtzzentrum für Schwerionenforschung GmbH
Jani Hakala: University of Jyväskylä
Ari Jokinen: University of Jyväskylä
Omar Kamalou: Grand Accélérateur National d’Ions Lourds, CEA/DRF-CNRS/IN2P3, B.P. 55027
Ivan Kojouharov: GSI Helmholtzzentrum für Schwerionenforschung GmbH
Veli S. Kolhinen: University of Jyväskylä
Jukka Koponen: University of Jyväskylä
Nikolaus Kurz: GSI Helmholtzzentrum für Schwerionenforschung GmbH
Nataša Lalović: Lund University
Christian Lorenz: Lund University
Benoit Mauss: RIKEN Nishina Center
Alice Mentana: Instituut voor Kern- en Stralingsfysica, KU Leuven
Iain D. Moore: University of Jyväskylä
Aurora Ortega Moral: Laboratoire de Physique des Deux Infinis de Bordeaux, UMR 5797 CNRS/IN2P3—Université de Bordeaux
Julien Pancin: Grand Accélérateur National d’Ions Lourds, CEA/DRF-CNRS/IN2P3, B.P. 55027
Philippos Papadakis: University of Jyväskylä
Jérôme Pibernat: Laboratoire de Physique des Deux Infinis de Bordeaux, UMR 5797 CNRS/IN2P3—Université de Bordeaux
Julien Piot: Grand Accélérateur National d’Ions Lourds, CEA/DRF-CNRS/IN2P3, B.P. 55027
Ilkka Pohjalainen: University of Jyväskylä
Juuso Reinikainen: University of Jyväskylä
Sami Rinta-Antila: University of Jyväskylä
Henning Schaffner: GSI Helmholtzzentrum für Schwerionenforschung GmbH
Olivier Sorlin: Grand Accélérateur National d’Ions Lourds, CEA/DRF-CNRS/IN2P3, B.P. 55027
Christelle Stodel: Grand Accélérateur National d’Ions Lourds, CEA/DRF-CNRS/IN2P3, B.P. 55027
Jean-Charles Thomas: Grand Accélérateur National d’Ions Lourds, CEA/DRF-CNRS/IN2P3, B.P. 55027
Maud Versteegen: Laboratoire de Physique des Deux Infinis de Bordeaux, UMR 5797 CNRS/IN2P3—Université de Bordeaux
Annika Voss: University of Jyväskylä

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: 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, $${{{{{{\mathcal{l}}}}}}}_{{{{{{\rm{p}}}}}}}=9$$ 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.

Date: 2023
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DOI: 10.1038/s41467-023-39389-2

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