AWhat changed
Interpreted recoil measurements from penetrating beryllium radiation as evidence for a neutral particle with mass close to the proton, testing that account against the high-energy photon alternative.
Scientific scope
Interpreted recoil measurements from penetrating beryllium radiation as evidence for a neutral particle with mass close to the proton, testing that account against the high-energy photon alternative. Scope limitation: This record begins with the February 1932 letter, which states its evidence and remaining uncertainty. It is distinct from the longer June report and later neutron theory. Bothe, the Joliot-Curies and Feather’s experimental roles are acknowledged in the source; they are not added to the letter’s byline. WRS has not reproduced the measurements.
Evidence
Assessment uses the catalogue-linked source evidence for the stated contribution. This record begins with the February 1932 letter, which states its evidence and remaining uncertainty. It is distinct from the longer June report and later neutron theory. Bothe, the Joliot-Curies and Feather’s experimental roles are acknowledged in the source; they are not added to the letter’s byline. WRS has not reproduced the measurements.
Contributors
- James Chadwick · SCIENCE: Named source contributor; exact labor shares are not measured.
- Chadwick, Possible Existence of a Neutron, Nature 129, 312 (27 February 1932); retyped one-page text
- Nature: Possible Existence of a Neutron; DOI 10.1038/129312a0
Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
Full scientific record · Browse contribution grades · Request a correction