{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"1fb5891dd76e423162e52c9d3e2accdaeefd347a46fe3ceea121a560fdc86cc4","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5cea30ab468774f768bf14a7e93ce4e5d26ee5e82bac43d0bc1bab75c90e4999","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"9e1273425c3a7aaa3e0c2264369cfdedeb6e750495c46c8257c035583b162d91","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":"2","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 $\\gamma \\sim 10^{3}-10^{4}$, 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":"5cea30ab468774f768bf14a7e93ce4e5d26ee5e82bac43d0bc1bab75c90e4999","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 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