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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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Physical Review Letters, 2023, vol. 131, p. 1-7

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Articles publicats en revistes (Física Quàntica i Astrofísica)

# metadata.dc.title[].value
High-Precision Spectroscopy of 20O Benchmarking Ab Initio Calculations in Light Nuclei