{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"6cd4e6a1a38c777042059218d0621ab7ed5e381b69bc02675bda942075458c50","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["849e743e6305e800eadad996b9c340b1e94cae5cce3d2ed80bb7ea53c13d7329","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"620180f15bdee830d28e86cb91d7efb713a287088f8e1c72734f56b87c5c1211","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"astro.galactic-gamma-ray-anomalies.positron-propagation","kind":"well-posed","literature_status":"contested","n":"2","parents":[],"plain":"If positrons made in the disk can drift into the bulge before annihilating, ordinary disk sources could explain the bulge glow.","posed_since":"","precise":"Determine the distribution of propagation distances of positrons born at energies below a few MeV in the warm, hot and neutral phases of the interstellar medium, with slowing-down times of $\\sim 10^{5}\\text{ to }10^{7}\\,\\mathrm{yr}$ and realistic magnetic turbulence. Answer: the fraction of disk-born positrons that annihilate in the bulge, compared with the observed bulge-to-disk ratio and line width.","problem_ref":"849e743e6305e800eadad996b9c340b1e94cae5cce3d2ed80bb7ea53c13d7329","references":"","settled_by":"Transport calculations with measured interstellar turbulence spectra, validated against the line width and positronium fraction.","status_note":"","title":"How far do Galactic positrons travel before annihilating?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"4e192899b8abc747c0521687437db3ea2163d4f587e3f41fe9bea6769108fb07","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"2115df2b15cdf07598b01418525c9bc07d782032bd24befc70f0b383e4aa1e7f","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"VCxsuP4uz9mvLv_GbFO12DRk-WIn4dcVc36Rm9pQRO1xFk9n2iDljTydoqNEkjo0XTFqgIGB6lQI3sYgpzauBw"},"schema":"pubphys.envelope/1"},"record_hash":"4e192899b8abc747c0521687437db3ea2163d4f587e3f41fe9bea6769108fb07","leaf_index":2360}