{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"9ea267326f040c015ccca58c130c859d6519c039d84e1196846b70b70eeb579a","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b","e64b0fdbf6f2348f1198e957d1fd4cfc83a1bc9d467826dd0a06ca5a75963b79"],"salt":"ed513addd6e46fce77643eb670d6225b17d3260bfa91f321747096749c810475","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":"2","parents":[],"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 $10^{-3}\\text{ to }1\\,M_{\\mathrm{sun}}/\\mathrm{s}$) 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":"e64b0fdbf6f2348f1198e957d1fd4cfc83a1bc9d467826dd0a06ca5a75963b79","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 matter?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"5d4193558d6f36cac7e5c0166ef4225ff62d63bb702f3a3e4a787e8a81e59a59","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"ca946fbdf71a1df315428346624179c4b737bf45d8f551a0d3738e97a2097f91","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"sW-d-3YaNhNvCm383KrAAuHjOFuHwuBzLcQhJucsL4AgifcGWh8VskLCPXPF-AdmS_Mte9DCcMexBcBWceu0DQ"},"schema":"pubphys.envelope/1"},"record_hash":"5d4193558d6f36cac7e5c0166ef4225ff62d63bb702f3a3e4a787e8a81e59a59","leaf_index":2410}