{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"b53824d90315a04796d8d08de73a533f2552106d28bfc7a79b8f622ce5fa2656","created":"2026-10-03T07:17:55Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","ec94cfc90cb6acfc4fa70a31cd2513e1f24fceb37eafca2fc8b0c231cf65a786"],"salt":"fedb7280f6fd3fea0e0a591e7e69a18e98599b5671c1aa87c7fa07014dc436af","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":"1","parents":[{"note":"","parent_revision":"ec94cfc90cb6acfc4fa70a31cd2513e1f24fceb37eafca2fc8b0c231cf65a786","relation":"special_case"}],"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 $\\sim 1e5\\text{ to }1e7\\,\\mathrm{yr}$ 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":null,"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":"2f78327303a97433a098b26582bcf23a29959fff36be6fdf51ec3c67a48452b7"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"849e743e6305e800eadad996b9c340b1e94cae5cce3d2ed80bb7ea53c13d7329","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"abed6fbe911e7dd54b19a9abb6f34fd28c8d6642120ee38212dac3b32d5a7c0f","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"btJ71AGyWM8EGBxwBeaBwgAjEeUEEWoyjg5lEAQnjj6MyqTJDz9MKESbY4EBDwoEm2iy7k3kK1Ckrub07uJaDQ"},"schema":"pubphys.envelope/1"},"record_hash":"849e743e6305e800eadad996b9c340b1e94cae5cce3d2ed80bb7ea53c13d7329","leaf_index":538}