{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"97d6f3bc615b2e0a791dc02d21714790484c9c110811a391cc0e35b67742bb80","created":"2026-10-03T07:18:08Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"59e1c8931f14897e603fa254a56ba0d8542cedf01c6edd0660d9801b793653f5","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"plasma.radiation-reaction.stochastic-emission-signature","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[],"plain":"Quantum theory says an electron loses energy in random discrete jumps when it emits gamma rays, while simpler models treat the loss as a smooth drag. Experiments have now seen quantum radiation reaction but cannot yet tell the random-jump picture from the smooth one.","posed_since":"","precise":"For $\\chi \\sim 0.1-1$ the quantum-stochastic description predicts electron energy straggling (growth of energy spread) and quantum quenching, both absent in quantum-continuous models (LL with a Gaunt-factor reduction of the emitted power). In head-on electron-laser collisions with $a0 \\sim 10-100$ and $\\gamma \\sim 1e3-1e4$, measure post-collision electron spectra (energy spread evolution, high-energy tail) or photon spectra with precision sufficient to reject the quantum-continuous model at $5\\,\\sigma$, controlling shot-to-shot jitter in collision timing and overlap.","problem_ref":null,"references":"","settled_by":"A laser-electron collision campaign with measured collision parameters per shot that distinguishes the two quantum models at $5\\,\\sigma$.","status_note":"Los et al. (Nature Communications, 2026) reported a $>5\\,\\sigma$ observation of radiation reaction with substantial quantum effects, favoring quantum over classical models, but the quantum-continuous and quantum-stochastic models performed comparably.","title":"Experimental proof of stochastic photon emission in quantum radiation reaction","topic_ref":"3337c3246637e5a9ce5f1a9514d7a2963fbb3cc69be03c6f6e2fbd8c411acb69"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"5cea30ab468774f768bf14a7e93ce4e5d26ee5e82bac43d0bc1bab75c90e4999","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"730cbff33f1dc85b04adce8a271250a61ba47a007c2db8d3b18d002d3aa6653e","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"kxjV5mPVQjZ9NucP5G813sHt5Z54felZc2ZKptIDz-hvhZZqE4GiM_Adoq9KyKUZkyEdEnfQ49XrsH3e7eRVDw"},"schema":"pubphys.envelope/1"},"record_hash":"5cea30ab468774f768bf14a7e93ce4e5d26ee5e82bac43d0bc1bab75c90e4999","leaf_index":1857}