Zanon, I.Clément, E.Goasduff, A.Menéndez Sánchez, JavierMiyagi, T.Assié, M.Ciemała, M.Flavigny, F.Lemasson, A.Matta, A.Ramos, D.Rejmund, M.Achouri, L.Ackermann, D.Barrientos, D.Beaumel, D.Benzoni, G.Boston, A. J.Boston, H. C.Bottoni, S.Bracco, A.Brugnara, D.de France, G.de Sereville, N.Delaunay, F.Desesquelles, P.Didierjean, F.Domingo-Prato, C.Dudouet, J.Eberth, J.Fernández, D.Fougères, C.Gadea, A.Galtarossa, F.Girard-Alcindor, V.Gonzales, V.Gottardo, A.Hammache, F.Harkness-Brennan, L. J.Hess, H.Judson, D. S.Jungclaus, A.Kaşkaş, A.Kim, Y. H.Kuşoğlu, A.Labiche, M.Leblond, S.Lenain, C.Lenzi, S. M.Leoni, S.Li, H.Ljungvall, J.Lois-Fuentes, J.Lopez-Martens, A.Maj, A.Menegazzo, R.Mengoni, D.Michelagnoli, C.Million, B.Napoli, D. R.Nyberg, J.Pasqualato, G.Podolyak, Zs.Pullia, A.Quintana, B.Recchia, F.Regueira-Castro, D.Reiter, P.Rezynkina, K.Rojo, J. S.Salsac, M. D.Sanchis, E.Şenyiğit, M.Siciliano, M.Sohler, D.Stezowski, O.Theisen, Ch.Utepov, A.Valiente-Dobón, J. J.Verney, D.Zielinska, M.2024-11-042024-11-042023-12-280031-9007https://hdl.handle.net/2445/216201The excited states of unstable 20O were investigated via -ray spectroscopy following the 19O⁡( , )⁢20O reaction at 8   ⁢MeV. By exploiting the Doppler shift attenuation method, the lifetimes of the 2+2 and 3+1 states were firmly established. From the -ray branching and ⁢2/ ⁢1 mixing ratios for transitions deexciting the 2+2 and 3+1 states, the ⁡( ⁢2) and ⁡( ⁢1) were determined. Various chiral effective field theory Hamiltonians, describing the nuclear properties beyond ground states, along with a standard USDB interaction, were compared with the experimentally obtained data. Such a comparison for a large set of -ray transition probabilities with the valence space in medium similarity renormalization group ab initio calculations was performed for the first time in a nucleus far from stability. It was shown that the ab initio approaches using chiral effective field theory forces are challenged by detailed high-precision spectroscopic properties of nuclei. The reduced transition probabilities were found to be a very constraining test of the performance of the ab initio models.7 p.application/pdfeng(c) American Physical Society, 2023Estructura nuclearReaccions nuclearsNivells d'energia (Mecànica quàntica)Nuclear structureNuclear reactionsEnergy levels (Quantum mechanics)info:eu-repo/semantics/article7463972024-11-04info:eu-repo/semantics/openAccess