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arXiv · 2405.14305

High-precision spectroscopy of $^{20}$O benchmarking ab-initio calculations in light nuclei

I. Zanon·E. Clément·A. Goasduff·J. Menéndez·T. Miyagi·M. Assié·M. Ciemała·F. Flavigny·A. Lemasson·A. Matta·D. Ramos·M. Rejmund·L. Achouri·D. Ackermann·D. Barrientos·D. Beaumel·G. Benzoni·A. J. Boston·H. C. Boston·S. Bottoni·A. Bracco·D. Brugnara·G. de France·N. de Sereville·F. Delaunay·P. Desesquelles·F. Didierjean·C. Domingo-Prato·J. Dudouet·J. Eberth·D. Fernández·C. Fougères·A. Gadea·F. Galtarossa·V. Girard-Alcindor·V. Gonzales·A. Gottardo·F. Hammache·L. J. Harkness-Brennan·H. Hess·D. S Judson·A. Jungclaus·A. Kaşkaş·Y. H. Kim·A. Kuşoğlu·M. Labiche·S. Leblond·C. Lenain·S. M. Lenzi·S. Leoni·H. Li·J. Ljungvall·J. Lois-Fuentes·A. Lopez-Martens·A. Maj·R. Menegazzo·D. Mengoni·C. Michelagnoli·B. Million·D. R. Napoli·J. Nyberg·G. Pasqualato·Zs. Podolyak·A. Pullia·B. Quintana·F. Recchia·D. Regueira-Castro·P. Reiter·K. Rezynkina·J. S. Rojo·M. D. Salsac·E. Sanchis·M. Şenyiğit·M. Siciliano·D. Sohler·O. Stezowski·Ch. Theisen·A. Utepov·J. J. Valiente-Dobón·D. Verney·M. Zielinska
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Abstract

The excited states of unstable $^{20}$O were investigated via $γ$-ray spectroscopy following the $^{19}$O$(d,p)^{20}$O reaction at 8 $A$MeV. By exploiting the Doppler Shift Attenuation Method, the lifetime of the 2$^+_2$ and 3$^+_1$ states were firmly established. From the $γ$-ray branching and E2/M1 mixing ratios for transitions deexciting the 2$^+_2$ and 3$^+_1$ states, the B(E2) and B(M1) 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 $γ$-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 EFT 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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I. Zanon, E. Clément, A. Goasduff, J. Menéndez, T. Miyagi, M. Assié, M. Ciemała, F. Flavigny, A. Lemasson, A. Matta, D. Ramos, M. Rejmund, L. Achouri, D. Ackermann, D. Barrientos, D. Beaumel, G. Benzoni, A. J. Boston, H. C. Boston, S. Bottoni, A. Bracco, D. Brugnara, G. de France, N. de Sereville, F. Delaunay, P. Desesquelles, F. Didierjean, C. Domingo-Prato, J. Dudouet, J. Eberth, D. Fernández, C. Fougères, A. Gadea, F. Galtarossa, V. Girard-Alcindor, V. Gonzales, A. Gottardo, F. Hammache, L. J. Harkness-Brennan, H. Hess, D. S Judson, A. Jungclaus, A. Kaşkaş, Y. H. Kim, A. Kuşoğlu, M. Labiche, S. Leblond, C. Lenain, S. M. Lenzi, S. Leoni, H. Li, J. Ljungvall, J. Lois-Fuentes, A. Lopez-Martens, A. Maj, R. Menegazzo, D. Mengoni, C. Michelagnoli, B. Million, D. R. Napoli, J. Nyberg, G. Pasqualato, Zs. Podolyak, A. Pullia, B. Quintana, F. Recchia, D. Regueira-Castro, P. Reiter, K. Rezynkina, J. S. Rojo, M. D. Salsac, E. Sanchis, M. Şenyiğit, M. Siciliano, D. Sohler, O. Stezowski, Ch. Theisen, A. Utepov, J. J. Valiente-Dobón, D. Verney, M. Zielinska. 2024-05-23. High-precision spectroscopy of $^{20}$O benchmarking ab-initio calculations in light nuclei. https://doi.org/10.1103/physrevlett.131.262501

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