{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"e869010a6cb130d04818a51f8854b6b81e9fc92121bc791be87fd351f300399d","created":"2026-10-03T07:18:08Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"03179f564d29f23239459b72ae11fa55fcd8177bedd37bf5f3ba9d2f926b281d","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"nuc.r-process-nuclear.fission-yields","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"In the most neutron-rich environments the r-process builds nuclei heavy enough to split by fission, and the fragments seed lighter elements. How these nuclei split is predicted only by uncertain models.","posed_since":"","precise":"For neutron-rich nuclei with $Z = 90\\ \\text{to}\\ 105$ and $A = 250\\ \\text{to}\\ 300$, determine fission barrier heights to 1 MeV and fragment mass yields for neutron-induced, beta-delayed and spontaneous fission. Answer: validated barrier and yield systematics and their effect on the $A = 110\\ \\text{to}\\ 170$ abundance pattern and on $\\mathrm{Th}/\\mathrm{U}$ production ratios used to date old stars.","problem_ref":null,"references":"","settled_by":"Microscopic fission calculations (time-dependent density functional theory) calibrated on new data for the most neutron-rich accessible actinides at FRIB and RIKEN.","status_note":"","title":"Fission barriers and fragment yields of r-process actinides","topic_ref":"008542e5fb6a342c0c764df9c1f7e628886ae3efa8048a1b79e833430d025799"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"bfa4d9b70c45816f4d339969ce5510b4ed75429738705d985660a85ba2f82676","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"350e162bf2a7b5cefc4475690741dd15387b3930cbb7f6327ff25785dec61b9d","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"dy4mkFsxbhQCEBd2bmruCDObvl8rXqKd9a2vwvmH7qsMwQ21o7cBADnHBvZcYir3ViNoza8wrvpc_etl0YUSCQ"},"schema":"pubphys.envelope/1"},"record_hash":"bfa4d9b70c45816f4d339969ce5510b4ed75429738705d985660a85ba2f82676","leaf_index":1807}