High-Precision Spectroscopy of 20O Benchmarking Ab Initio Calculations in Light Nuclei

The 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 trans...

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Autores: Zanon, I., Clément, E., Goasduff, A., Menéndez Sánchez, Javier, Miyagi, 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.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/216201
Acceso en línea:https://hdl.handle.net/2445/216201
Access Level:acceso abierto
Palabra clave:Estructura nuclear
Reaccions nuclears
Nivells d'energia (Mecànica quàntica)
Nuclear structure
Nuclear reactions
Energy levels (Quantum mechanics)
Descripción
Sumario:The 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.

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