Olaizola, B.Fraile Prieto, Luis MarioMach, Henryk AndrzejNowacki, F.Poves, A.Aprahamian, A.Briz, J. A.Cal González, J.Ghita, D.Koster, U.Kurcewicz, W.Lesher, S. R.Pauwels, D.Picado, E.Radulov, D.Simpson, G. S.Udías Moinelo, José Manuel2023-06-172023-06-172019-02-252469-998510.1103/PhysRevC.99.024321https://hdl.handle.net/20.500.14352/13412©2019 American Physical Society. This work was partially supported by the Spanish MINECO through Projects No. FPA2014-57196 and No. FPA2015-65035-P and Centro de Excelencia Severo Ochoa Programme (Project No. SEV-2016-0597). Support by Grupo de Física Nuclear (GFN-UCM) and by the European Union Seventh Framework through ENSAR (Contract No. 262010) is also acknowledged. B.O. acknowledges funding by the CPAN project. S.R.L. acknowledges funding by the U.S. National Science Foundation under Contract No. PHY-0758100. The authors thank Dr. L. Toker for her invaluable help preparing the figures for this manuscript.The low-energy structure of Co-65 was studied by means of gamma(-) and fast-timing spectroscopy at the ISOLDE/CERN facility. The known level scheme of Co-65 populated following the beta(-) decay of Fe-65 was expanded. The experimental results were compared with large-scale shell-model calculations. The measured long lifetime of the (1/2(1)(-)) level confirms its nature as a highly collective state with proton excitations across the Z = 28 gap and neutrons across the N = 40 subshell.engjournal articlehttp://dx.doi.org/10.1103/PhysRevC.99.024321https://journals.aps.org/open access539.1Neutron-rich nucleiFísica nuclear2207 Física Atómica y Nuclear