Historical origin and attribution of the term “neutrino”

Ascertain the precise historical origin and authorship of the term "neutrino" within the Rome school of physics, including whether Edoardo Amaldi first proposed "neutronino" and Enrico Fermi subsequently contracted it to "neutrino," or the reverse, and establish the definitive chronology of its earliest official use.

Background

The appendix presents multiple, slightly differing accounts of how the name "neutrino" originated: Edoardo Amaldi’s 1984 recollection attributing a humorous coinage within the Rome institute and Fermi’s subsequent use at international meetings; Ginestra Amaldi’s 1961 narrative of Fermi’s classroom exchange; and Ugo Amaldi’s textbook summary referencing Fermi's first international use. The author concludes that the exact sequence of coinage and contraction between Amaldi and Fermi cannot be established with certainty from available sources.

While it is clear that Fermi used the term on an official occasion, the unresolved question remains which of the two (Amaldi or Fermi) first proposed the specific form and how the contraction from "neutronino" to "neutrino" occurred, motivating further historical investigation of primary documents and testimonies.