PT Journal
AU Zanon, Iea
   Domingo-Pardo, C
   Gadea, A
TI High-Precision Spectroscopy of O-20 Benchmarking Ab Initio Calculations in Light Nuclei
SO Physical Review Letters
JI Phys. Rev. Lett.
PY 2023
BP 262501
EP 7pp
VL 131
IS 26
DI 10.1103/PhysRevLett.131.262501
LA English
AB The excited states of unstable O-20 were investigated via.-ray spectroscopy following the O-19(d, p)O-20 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 gamma-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 gamma-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.
ER