The Halban and Preiswerk experiment was a tour de force, and not entirely convincing. They claimed that cold neutrons were scattered to higher angles by a crystalline material, but does that really prove wavelike diffraction? Less energetic particles might also be scattered to higher angles according to classical mechanics. (Just being provocative :-)
Alan ________________________________ Dr Alan Hewat, NeutronOptics Grenoble, FRANCE (from phone) [email protected] +33.476984168 VAT:FR79499450856 http://NeutronOptics.com/hewat _______________________________ On Mon, 22 Sept 2025, 11:52 Eduard E. Levin, <[email protected]> wrote: > Hi Martin, > > the paper is available online: > https://gallica.bnf.fr/ark:/12148/bpt6k3155r/f73.item > > Best regards, > Eduard Levin > > On 22.09.2025 12:45, [email protected] wrote: > > Dear Rietveld users > > > > I wonder if anyone can get hold of this very historic paper for me > > > > Halban, H. and Preiswerk, P. (1936) Preuve expérimentale de la > diffraction des neutrons. Comptes Rendus de l’Académie des Sciences, 203, > 73-75. > > > > It seems that in 1936 two groups, one in Columbia and one in Paris, > demonstrated that neutrons show wave-particle duality. Many people know > about the two groups who showed the electrons have wave-particle duality, > and many people knows the story of how it was shown that the photon shows > wave-particle duality. But very few people are aware of the same for the > neutron (even ChatGPT needs to be told the answer before it agrees that > this work was carried out). > > > > The Colombia group’s work is easy to find in the literature, but the > Paris group’s paper has me stumped. > > > > I want to write a little article about this but to be fair to the Paris > group I really ought to see their paper. > > > > So I wonder, does anyone have access to a PDF copy of this paper. My > efforts have floundered! > > > > Thanks for anyone who can try to obtain this. I feel these people should > not be so quickly forgotten. > > > > With best wishes > > > > Martin Dove > > > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > Please do NOT attach files to the whole list > <[email protected]> > > Send commands to <[email protected]> eg: HELP as the subject with no body > text > > The Rietveld_L list archive is on > http://www.mail-archive.com/[email protected]/ > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > > -- > ------ > Eduard Levin > Department of Electrochemistry > Chemical Faculty > Moscow State University > Leninskie Gory 1.-Str.3 > 119991 Moscow > Russia > E-mail: [email protected] > Tel +7 (495) 939-1321 > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > Please do NOT attach files to the whole list <[email protected] > > > Send commands to <[email protected]> eg: HELP as the subject with no body > text > The Rietveld_L list archive is on > http://www.mail-archive.com/[email protected]/ > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > >
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