{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"31ab833b40f88bba517d61a7b985c904bcfc04c26ede4179f35b884ac20de8d8","created":"2026-10-03T07:17:55Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"47d3d3a7cbee3189b5fffa9febd6fc5b454671f5bf8585617f88e4a0b2c3264f","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"astro.r-process-sites.dominant-site","kind":"phenomenon","literature_status":"contested","n":"1","parents":[],"plain":"Neutron-star mergers, rare collapsing stars and flares from magnetars can all make r-process elements; their shares are unknown.","posed_since":"1957","precise":"Determine the fractional contributions of neutron-star mergers (including neutron star-black hole), collapsars and magnetorotational supernovae, and magnetar giant flares to the Galactic r-process mass. Constraints: binary neutron star merger rate from gravitational waves ($\\sim 10\\text{ to }1700\\,\\mathrm{Gpc}^{-3}\\,\\mathrm{yr}^{-1}$), ejecta per event ($\\sim 0.01\\text{ to }0.05\\,M_{\\mathrm{sun}}$), the $[\\mathrm{Eu}/\\mathrm{Fe}]$ versus $[\\mathrm{Fe}/\\mathrm{H}]$ trend and its scatter in metal-poor stars, and Pu-244 in deep-sea crusts. Answer: fractions with uncertainties.","problem_ref":null,"references":"","settled_by":"A tighter merger rate and kilonova yield sample from gravitational-wave events, together with direct detection of r-process signatures from collapsars.","status_note":"2025: delayed MeV emission after the 2004 SGR 1806-20 giant flare was interpreted as radioactive decay of about $1e-6\\,M_{\\mathrm{sun}}$ of fresh r-process matter, adding magnetar flares as a minor site.","title":"Which site dominates the r-process inventory of the Milky Way?","topic_ref":"629fb53d8771f28ff08120cbd19ad49c2c6fdc9fd60798b0f0a9704b24fc3033"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"2b0d5d2ed8e499603637f1fc0a3ee48b7ad5d64e04786e66086c6d908745ec96","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"d3ea91bc0db06d0218bc22ff23f4c857f96646ea36b2d651234a7376adf187ce","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"v-nDqRI9y0bFD1Y273jTesXG1ovt3inp4LIAwU7nIEa2EW0DWQY2jewgWEQElXR-Il3Ch9CFSeVBYbYCwqDCBA"},"schema":"pubphys.envelope/1"},"record_hash":"2b0d5d2ed8e499603637f1fc0a3ee48b7ad5d64e04786e66086c6d908745ec96","leaf_index":591}