{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"6f564c274aae524c75f06c7be57cea88542caff239008e7ce914cb48bda449b1","created":"2026-10-03T07:17:55Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["2b0d5d2ed8e499603637f1fc0a3ee48b7ad5d64e04786e66086c6d908745ec96","5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"fa3b165e67e8842736894ecfbfd224bedbc8f9d1b6aa352ed3718a5b1cb0dd63","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"astro.r-process-sites.collapsar-yield","kind":"well-posed","literature_status":"contested","n":"1","parents":[{"note":"","parent_revision":"2b0d5d2ed8e499603637f1fc0a3ee48b7ad5d64e04786e66086c6d908745ec96","relation":"special_case"}],"plain":"The disk around a black hole born inside a collapsing star could blow off neutron-rich gas that makes gold, but whether the gas stays neutron-rich enough is disputed.","posed_since":"2019","precise":"In GRMHD simulations of collapsar disks (accretion rates $1e-3\\text{ to }1\\,M_{\\mathrm{sun}}/\\mathrm{s}$) with neutrino transport, determine the electron-fraction $Y_{e}$ distribution of the outflows and the mass with $Y_{e} < 0.25$ needed for lanthanides and the third r-process peak. Answer: r-process yield per event in $M_{\\mathrm{sun}}$, with the dependence on neutrino-transport method quantified.","problem_ref":null,"references":"","settled_by":"Converged simulations with Monte Carlo or moment neutrino transport from independent groups, plus detection or exclusion of r-process emission in late spectra of GRB supernovae.","status_note":"Simulations since 2020 with more detailed neutrino transport found less neutron-rich outflows than the 2019 estimate that collapsars could dominate.","title":"Do collapsar accretion disks eject neutron-rich r-process 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