Short-range correlations (SRCs) provide the link between low- and high-energy nuclear physics and can be quantified by two-nucleon densities. We present calculations of the two-nucleon densities using free-space similarity renormalization group (SRG)-evolved operators and in-medium SRG (IMSRG) ground states with a softened chiral interaction. Our calculations benchmark well against no-core shell model results with unevolved operators and Hamiltonians in ${}^4\mathrm{He}$. We explicitly include the induced three-body (3b) density operators for the first time which, together with the 3b Hamiltonians, provide the full 3b effects. We show pronounced 3b effects in the ${}^{16}\mathrm{O}$ two-nucleon densities. Combined with valence-space IMSRG method, we extend the calculation to the oxygen isotopic chain. This approach enables a consistent ab initio description of low-energy properties and SRCs within one framework and offers predictions for the upcoming SRC measurements in unstable nuclei.

Close

PrevNext

View figure in article

• Few-body systems
• Nuclear forces
• Nuclear structure & decays
• 6 ≤ A ≤ 19
• A ≤ 5