2023/08/03 by Le, Hoai, Haidenbauer, Johann, Meißner, Ulf-G. +1
#FOS: Physical sciences #Nuclear Theory (nucl-th)
paper · doi:10.48550/arxiv.2308.01756
Separation energies of light Λ hypernuclei (A≤ 5) and their theoretical uncertainties are investigated. Few-body calculations are performed within the Faddeev-Yakubovsky scheme and the no-core shell model. Thereby, modern and up-to-date N N and Y N potentials derived within chiral effective field theory are employed. % It is found that the numerical uncertainties of the few-body methods are well under control and an accuracy of around 1 keV for the hypertriton and of less than 20 keV for the separation energies of the 4ΛHe and 5ΛHe hypernuclei can be achieved. Variations caused by differences in the N N interaction are in the order of 10 keV for 3ΛH and no more than 110 keV for A=4, 5 Λ hypernuclei, when recent high-precision potentials up to fifth order in the chiral expansion are employed. The variations are smaller than expected contributions from chiral Y N N three-body forces (3BFs) which arise at the chiral order of state-of-the-art Y N potentials. Estimates for those 3BFs are deduced from a study of the truncation uncertainties in the chiral expansion.