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High-Precision Spectroscopy of 20O Benchmarking Ab Initio Calculations in Light Nuclei
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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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ZANON, I., et al. High-Precision Spectroscopy of 20O Benchmarking Ab Initio Calculations in Light Nuclei. Physical Review Letters. 2023. Vol. 131, num. 1-7. ISSN 0031-9007. [consulted: 16 of June of 2026]. Available at: https://hdl.handle.net/2445/216201