Enrico Fermi

Record year1933

summaryIt first represented neutron-to-proton conversion and electron/neutrino production as a computable interaction. The outcome is the 1933–34 low-energy theory of beta decay and weak interaction; it does not claim later V–A theory, electroweak unification, W/Z discovery, or neutrino experiments.

M rationaleNature's contemporaneous note describes the beta-decay theory, while the Nobel history of the weak force explicitly states both its incompleteness and foundational status; it is rated M6.6 as a foundational physics theory.

attribution rationaleFermi 0.56, Pauli 0.14, theoretical prehistory 0.17, experimental data 0.06, unresolved 0.07.

overlap boundary1933–34 low-energy theory of beta decay and weak interaction; does not claim later V–A, electroweak unification, W/Z discovery, or neutrino experiments.

Evidence gapsNeed original text and early correspondence to refine Pauli's input and the first-version form.

Record year1926

summaryIt gives the statistical law for systems of indistinguishable particles subject to exclusion constraints. In 1926, the exclusion principle was applied to establish quantum statistics for half-integer-spin particles; Fermi and Dirac independently arrived at a common completed outcome. It does not backfill all condensed-matter and astrophysical applications.

M rationaleThe Nobel biography and Italian history-of-science archives confirm Fermi's priority, Dirac's independent arrival at the same conclusion, and broad applicability; as a foundational statistical method, it is rated M6.8.

attribution rationaleFermi 0.43, Dirac 0.29, Pauli 0.10, statistical prehistory 0.10, institutions 0.03, unresolved 0.05.

overlap boundaryIn 1926, the exclusion principle was used to establish quantum statistics for half-integer-spin particles, with Fermi and Dirac independently arriving at a common completed outcome; not all condensed-matter and astrophysical applications are backfilled.

Evidence gapsA formula-by-formula comparison of the original papers is needed to identify differences between Fermi's and Dirac's independent formulations.

Record year1934

summaryIt systematically demonstrated neutrons as a broad-spectrum nuclear probe and identified a reusable method by which slow neutrons increase reaction probability. From 1934, the work covered neutron bombardment of 63 elements, induced radioactivity, hydrogen moderation, and absorption-diffusion studies; it does not claim the discovery of nuclear fission or repeat the CP-1 project.

M rationaleFermi's Nobel lecture names Amaldi, d'Agostino, Pontecorvo, Rasetti, and Segrè, and records the 37/63-element results; APS lists Amaldi as co-author on the papers, and the team experimental method is rated M6.5.

attribution rationaleFermi 0.31, the five named collaborators each 0.08–0.10 totaling 0.42, prehistory 0.13, institutions 0.06, unresolved 0.08.

overlap boundaryFrom 1934, neutron bombardment of 63 elements, induced radioactivity, hydrogen moderation and absorption-diffusion studies; the discovery of nuclear fission is not attributed here, nor is the CP-1 project repeated.

Evidence gapsThe item-by-item experimental initiative, the serendipitous paraffin chain, and technician identities require laboratory notebooks.

Record year1949

summaryIt provides a physical mechanism by which particles gradually gain energy through statistical collisions. The outcome is the 1949 second-order Fermi mechanism for stochastic energy gain by cosmic rays in moving magnetic structures; it does not claim subsequent first-order shock acceleration or all high-energy astrophysics.

M rationaleThe Nobel biography lists it as an important theory of his later years; as an independent astrophysical-particle mechanism, it is rated M5.8.

attribution rationaleFermi 0.57, prehistory 0.23, observational community 0.08, institutions 0.04, unresolved 0.08.

overlap boundary1949 second-order Fermi mechanism for stochastic energy gain of cosmic rays in moving magnetic structures; does not claim subsequent first-order shock acceleration and all high-energy astrophysics.

Evidence gapsThe magnetic cloud hypothesis and subsequent corrections require verification against the original text.

Record year1941

summaryIt integrated reactor physics, materials, and control systems into the first controlled self-sustaining chain reaction. From the 1941 Fermi–Szilard pile design to the controlled self-sustaining reaction on 1942-12-2 at CP-1, slow-neutron science is already accounted for in the preceding entry; this entry counts only engineering integration and the completed operational result.

M rationaleDOE historical records clearly attribute the Fermi–Szilard design and delivery by Fermi's team; it is rated M6.6 as a complex engineering prototype.

attribution rationaleFermi 0.20, Szilard 0.16, CP-1 team 0.35, pre-fission history 0.11, institutions 0.09, unresolved 0.09.

overlap boundaryFrom the 1941 Fermi–Szilard pile design to the controlled self-sustaining reaction on 1942-12-2 at CP-1; slow-neutron science is accounted for in the preceding entry, and this entry counts only engineering integration and the completed operational result.

Evidence gapsRequires CP-1 roster, graphite/uranium supply chain, and safety role archives.

Record year1927

summaryIt compresses the multi-electron atom problem into a tractable electron-density approximation. The outcome is the 1927 statistical approximation to atomic electron density; the core of Fermi statistics is retained in the preceding item, and this entry counts only the residual atomic-density-model application.

M rationaleThe Nobel biography lists it as an important semi-quantitative method for atomic properties; it is rated M5.8 as an independent computational tool.

attribution rationaleFermi 0.38, Thomas 0.34, prehistory 0.17, team 0.04, unresolved 0.07.

overlap boundary1927 atomic electron density statistical approximation; Fermi statistics core retained in the preceding item, this point counts only the residual application of the atomic density model.

Evidence gapsThe differences between the original Thomas/Fermi papers and the division of numerical work need to be detailed.

Record year1929

M rationaleIt applies canonical quantization to interacting fields and integrates invariance, conserved quantities, and connections between field and particle formulations; it is rated M7.0. The boundary excludes postwar renormalization, all modern quantum field theory, and all subsequent applications.

attribution rationaleHeisenberg 32%, Pauli 32% counted as joint theoretical construction; Jordan, Dirac, Weyl, Fermi and other precursor inputs, as well as direct inputs from the publishing institution and the first original paper still unresolved, retain the remaining budget.

Evidence gapsThe first original paper has not yet been read and verified; there remain gaps in the internal work split between the two authors and in the complete transmission chain toward renormalized quantum field theory.