1,721,106 research outputs found
Frederic Joliot, Irene Curie and the early history of the positron (1932-33)
No full textAs is well known, the positron was discovered in August 1932 by Carl Anderson while studying cloud chamber tracks left by cosmic rays. Far less known is the fact that a few months before Anderson’s discovery, in April 1932, Frédéric Joliot and Irène Curie had missed an opportunity to discover the positron during a nuclear physics experiment. One year later, in April 1933, the French researchers eventually succeeded in discovering the mechanism of positron–electron pair production. The complex relationship between Anderson’s discovery of the positron, Joliot and Curie’s missed discovery, and their following work on the pair production is discussed here in detail
P.M.S. Blackett, G. Occhialini and the invention of the counter-controlled cloud chamber (1931-32)
No full textAmong the most important detecting devices in the 1930s, cosmic-ray experimental physics figures the so-called ‘counter controlled cloud chamber’. This apparatus was jointly developed in 1932 by P M S Blackett, the cloud chamber expert at the Cavendish Laboratory in Cambridge and by G. Occhialini, who mastered the counting coincidence technique following his work under the guidance of B. Rossi in Florence. In this paper we address the original technical description of the apparatus and place its development within the historical and scientific framework of 1930s physics
I fisici senatori 1848-1943
No full textCon la pubblicazione di questo prestigioso volume la SIF intende dare risalto all'impegno e alla presenza dei fisici senatori nei settori più diversi della vita del Paese, che li vede attivi e coinvolti nel trattare i temi più disparati. Spesso determinanti nell'iter delle leggi, nella promozione di disegni di leggi che hanno lasciato un segno indelebile nella vita del nostro Paese, i fisici senatori compaiono dietro trattati internazionali, infrastrutture strategiche quali ferrovie e reti telegrafiche, fonti energetiche, riforme della scuola, dell'università e della pubblica amministrazione
A note on the Wilson cloud chamber
No full textA technical description of the ‘Wilson cloud chamber’ developed by C. T. R. Wilson in 1911–12 will be given here. This instrument soon became a fundamental tool of research in nuclear, cosmic ray and elementary particle physics. The close examination of the expansion apparatus, the illumination method and the photographic method shows that the cloud chamber is a fine example of experimental ingenuity
Il Gabinetto di Fisica dell’Università di Genova e le ricerche sul magnetismo terrestre: 1833 – 1890
No full textStrumenti e documentazione scientifica proveniente dalle missioni esplorative condotte dal Duca degli Abruzzi nei primi decenni del ‘900
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