{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"05d1ef5494100e8026608c51daa0ccd5989b5454181045596a2b86d69566020e","created":"2026-10-03T07:18:07Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"a01de66d6ec6b55e854803fcaef84f45413a22c1dc3d7cef345d04024e65ea86","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"nuc.ab-initio-nuclei.binding-and-radii","kind":"phenomenon","literature_status":"partially-resolved","n":"1","parents":[],"plain":"First-principles calculations with many common nuclear forces either bind medium-mass nuclei correctly but make them too small, or get the size right and the binding wrong. The cause is thought to lie in the three-nucleon force (a force that acts only when three nucleons are close together).","posed_since":"","precise":"With NN plus 3N interactions from chiral EFT fitted only to few-body data ($A \\le 4$, optionally nuclear-matter saturation), predict ground-state energies and charge radii of 16O, 40Ca, 48Ca and 208Pb within 1 percent, and saturation of symmetric nuclear matter ($n_0$ about $0.16\\ \\mathrm{fm}^{-3}$, $E/A$ about $-16\\ \\mathrm{MeV}$). Answer: an interaction with quantified truncation errors meeting these targets, and identification of the 3N terms that control saturation.","problem_ref":null,"references":"","settled_by":"Ab initio calculations with Bayesian uncertainty quantification reproducing binding and radii from 4He to 208Pb using interactions fixed in few-body systems.","status_note":"$\\Delta$-full chiral interactions fitted to light-nucleus and nuclear-matter data (Jiang et al., 2020) improved radii and binding together, but predictions remained sensitive to the fit protocol as of 2026.","title":"Simultaneous binding energies and charge radii of medium-mass nuclei","topic_ref":"2e3c9bbdd2ce5849bb4ba420a815301d70db5fbf0341e1a0ed3d81994b4e4b35"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"67b233ba4f6afb4d4a188ea454d0f8752b7f46023a6d14797fc11a634d690379","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"c791b87557298fae98615c58d8f88c598a8f9420ad9bc0e6a8b26c99530dbfcd","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"_0dZZmJ9gG3yEb5PVt5kn0YFbPkW-DLPeZE_BSzxBR8zjRdDrZc3RFv9mqCy7Jwupqxqc5XJW7IUUOM42y5uDQ"},"schema":"pubphys.envelope/1"},"record_hash":"67b233ba4f6afb4d4a188ea454d0f8752b7f46023a6d14797fc11a634d690379","leaf_index":1730}