Elucidating the nature of the proton radioactivity and branching ratio on the first proton emitter discovered 53mCo
Sarmiento, L. G., Roger, T., Giovinazzo, J., Brown, B. A., Blank, B., Rudolph, D., Kankainen, A., Alvarez-Pol, H., Arokia Raj, A., Ascher, P., Block, M., Caamaño-Fresco, M., Caceres, L., Canete, L., Cox, D. M., Eronen, T., Fahlander, C., Fernández-Domínguez, B., Forsberg, U., . . . Voss, A. (2023). Elucidating the nature of the proton radioactivity and branching ratio on the first proton emitter discovered 53mCo. Nature Communications, 14, Article 5961. https://doi.org/10.1038/s41467-023-39389-2
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2023Discipline
Hyvinvoinnin tutkimuksen yhteisöKiihdytinlaboratorioResurssiviisausyhteisöSchool of WellbeingAccelerator LaboratorySchool of Resource WisdomCopyright
© The Author(s) 2023
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, 𝓁p=9 and 𝓁p=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.
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https://converis.jyu.fi/converis/portal/detail/Publication/188987449
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Research Council of Finland; European CommissionFunding program(s)
Research costs of Academy Research Fellow, AoF; Academy Research Fellow, AoF; ERC Consolidator Grant; Research infrastructures, H2020
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
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We are grateful to the accelerator staff at GANIL and JYFL. This work was supported by the following Research Councils and Grants: European Union’s Horizon 2020 Framework research and innovation programme 654002 (ENSAR2); Swedish Research Council (Vetenskapsrådet, VR 2016-3969); NSF grant PHY-1811855. Academy of Finland under the Finnish Centre of Excellence Programme 2012–2017 (Nuclear and Accelerator Based Physics Research at JYFL). The ACTAR TPC development was funded by the European Research Council under the European Union’s Seventh Framework Program (FP7/2007-2013)/ERC grant agreement no 335593 and by the Conseil Régional d’Aquitaine, France (grant no 2014-1R60402—00003319). B.A.B. was supported by NSF grant PHY-2110365. A.K. acknowledges the support from the Academy of Finland under grants No. 275389, 284516 and 312544 and from the European Union’s Horizon 2020 research and innovation program under grant agreement No. 771036 (ERC CoG MAIDEN). G.F.G. acknowledges the support of the Natural Sciences and Engineering Research Council of Canada (NSERC). M.C.-F., B.F.-D., and J.L.-F. acknowledge financial support from Xunta de Galicia (Spain) through grant number ED481A-2020/069, project number ED431B-2018/015, and “Centro singular de investigación de Galicia” accreditation 2019-2022, from the Spanish Research State Agency through the project PGC2018-096717-B-C22, and partial support by European Union ERDF, and the “María de Maeztu” Units of Excellence program MDM-2016-0692. B.M. is an International Research Fellow of the Japanese Society for the Promotion of Science. Open access funding provided by Lund University. ...License
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