The excited states of unstable ^{20}O were investigated via γ-ray spectroscopy following the ^{19}O(d,p)^{20}O reaction at 8  AMeV. By exploiting the Doppler shift attenuation method, the lifetimes 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 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.

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, Z. 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, C. Theisen, A. Utepov, J.J. Valiente-Dobón, D. Verney, M. Zielinska. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 131:26(2023 Dec 28), pp. 262501.1-262501.7. [10.1103/PhysRevLett.131.262501]

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

S. Bottoni;A. Bracco;S. Leoni;A. Pullia;
2023

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  AMeV. By exploiting the Doppler shift attenuation method, the lifetimes 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 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.
Settore FIS/04 - Fisica Nucleare e Subnucleare
   Exploring the Universe through Strong Interactions
   EUSTRONG
   European Commission
   Horizon 2020 Framework Programme
   101020842
28-dic-2023
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1024368
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