Work

Ab initio calculations of nuclear charge radii across and beyond 132Sn: Putting chiral EFT nuclear interactions to the test

Year: 2026

Type: article

Abstract: Charge radii are investigated along the Tin isotopic chain via ab initio Bogoliubov coupled cluster calculations at the singles and doubles level. In addition to the reproduction of absolute radii, the parabolic behavior of isotopic shifts between the N = 50 and N = 82 magic numbers and the kink through 132 Sn are shown to provide stringent tests for state-of-the-art chiral effective field theory ( χ EFT) inter-nucleon interactions. Indeed, none of the employed fine-tuned interactions can capture all such key characteristics. Eventually, the pronounced sensitivity of the results to the employed Hamiltonian beyond 132 Sn provides a unique playground to pin down critical attributes of χ EFT inter-nucleon interactions in the future. This calls for measuring isotopic shifts both towards 100 Sn and beyond 134 Sn, as well as for performing high-accuracy ab initio calculations of mean-square radii in heavy open-shell nuclei by adding both triples corrections to the many-body wave function and the two-body charge density correction to the operator.

Source: Physics Letters B

DOI: 10.1016/j.physletb.2026.140524

Authors: P. Demol, U. Vernik, T. Duguet, A. Tichai