Elekes, Z.Panin, V.Rodríguez Frutos, Tomás RaúlSieja, K.Ahn, D. S.Al-Adili, A.Baba, H.Stefanescu, A. I.Cook, K. J.Yoshitome, Y.2025-02-032025-02-032023-09-10Elekes, Z.; Panin, V.; Rodríguez, T.R.; Sieja, K.; Ahn, D.S.; Al-Adili, A.; Baba, H.; Stefanescu, A.I.; Cook, K.J.; Dósa, Cs.; et al. Shape Coexistence in 66Se. Physics Letters B 2023, 844, 138072, doi:10.1016/j.physletb.2023.138072.10.1016/j.physletb.2023.138072https://hdl.handle.net/20.500.14352/117573Artículo firmado por 48 autoresThe nuclear structure of 66Se, nucleus beyond the N=Z line on the proton-rich side of the valley of stability, was investigated by the neutron knock-out reaction 67Se(12C,X)66Se using a 12C target. The analysis of the singles spectrum of the γ-rays emitted during the de-excitation of the populated low-lying excited states revealed two previously detected (927(4) keV, 1460(32) keV) and three new (744(6) keV, 1210(17) keV, 1661(23) keV) transitions. The 744-keV, the 1210-keV, and the 1460-keV transitions were found to be in coincidence with the one at 927 keV. The spectrum coincident with the 927-keV transition showed a further possible transition at 299(35) keV, which was obscured by significant atomic background in the singles spectrum. This transition might correspond to a peak previously reported at 273(5) keV that could not be assigned to 66Se unambiguously. Based on a comparison of the experimental data to theoretical calculations, four new excited states are proposed which suggest that 66Se exhibits shape coexistence.engAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/journal articlehttps://dx.doi.org/10.1016/j.physletb.2023.138072open access539.153Neutron knock-out reactionγ -ray spectroscopyNuclear structureShape coexistenceFísica nuclear22 Física