Rossi , Bruno Benedetti
(1905–1994) Italian–American physicist
Rossi, born the son of an electrical engineer in Venice, Italy, was educated at the universities of Padua and Bologna. He first taught at the universities of Florence and Padua before emigrating to America in 1938. There he worked at Chicago and Cornell universities and in 1943 moved to Los Alamos to work on the development of the atom bomb. After World War II he was appointed, in 1946, to the chair of physics at the Massachusetts Institute of Technology where he remained until his retirement in 1970.
Rossi's main work was in the field of cosmic rays. These had first been detected by Victor Hess in 1911 but, by 1930, there was little agreement on their real nature; it was not even certain whether or not they were charged particles. To answer this question most physicists had been inconclusively searching for a variation in intensity with latitude.
Instead, in 1930 Rossi proposed an experimental arrangement that would search for any east–west asymmetry. Charged particles coming from outer space would be deflected by the Earth's magnetic field eastward if positively charged and westward if negatively charged. To detect them Rossi suggested that two or more Geiger counters be arranged pointing eastward with their centers arranged in a straight line. A similar arrangement should be set up pointing westward. Thus only particles coming from the direction along the axis of the counters would register simultaneously on both or all of them. In 1934 Rossi set up his counters in the mountains of Eritrea and found a 26% excess of particles traveling eastward, thus showing that the majority of cosmic-ray particles are positively charged.
Rossi was the author of several books, including Cosmic Rays(1964), which has been used by generations of physics students.

Scientists. . 2011.

Look at other dictionaries:

  • Bruno Debrandt — est un comédien de théâtre français, qui a aussi commencé une carrière d acteur d abord dans des courts métrages, puis des épisodes de série et est maintenant un acteur principal de série de télévision et de téléfilm. Il poursuit parallèlement sa …   Wikipédia en Français

  • Prix Saint-Vincent du journalisme — Le président italien Giorgio Napolitano remet le prix Saint Vincent 2006 au journaliste Federico Rampini (28 septembre 2006) Le prix Saint Vincent du journalisme, connu aussi comme prix Saint Vincent, est un prix journalistique, remis par un jury …   Wikipédia en Français

  • literature — /lit euhr euh cheuhr, choor , li treuh /, n. 1. writings in which expression and form, in connection with ideas of permanent and universal interest, are characteristic or essential features, as poetry, novels, history, biography, and essays. 2.… …   Universalium

  • List of West European Jews — Apart from France, established Jewish populations exist in the Netherlands, Belgium, Germany, Italy and Switzerland. With the original medieval populations wiped out by the Black Death and the pogroms that followed it, the current Dutch and… …   Wikipedia

  • Montevideo — For other uses, see Montevideo (disambiguation). Montevideo Former colonial name: City of San Felipe y Santiago de Montevideo   Capital city   …   Wikipedia

  • Liste der Capitani Reggenti von San Marino von 1700 bis 1900 — Liste der Capitani Reggenti von San Marino seit 1700 Inhaltsverzeichnis 1 Amtsantritt im 17. Jahrhundert (bis 1700) 2 Amtsantritt im 18. Jahrhundert (1701 bis 1800) 3 Amtsantritt im 19. Jahrhundert (1801 1900) …   Deutsch Wikipedia

  • Liste der Capitani Reggenti von San Marino seit 1700 — Inhaltsverzeichnis 1 Amtsantritt im 17. Jahrhundert (bis 1700) 2 Amtsantritt im 18. Jahrhundert (1701 bis 1800) 3 Amtsantritt im 19. Jahrhundert (1801 1900) …   Deutsch Wikipedia

  • Italy — /it l ee/, n. a republic in S Europe, comprising a peninsula S of the Alps, and Sicily, Sardinia, Elba, and other smaller islands: a kingdom 1870 1946. 57,534,088; 116,294 sq. mi. (301,200 sq. km). Cap.: Rome. Italian, Italia. * * * Italy… …   Universalium

  • Bibliography — Introduction Listed are a variety of sources: official government reports; the reports of nongovernmental organizations at the international, regional, and national levels; and works by individuals. The works by individuals include academic… …   Historical Dictionary of the “Dirty Wars”

  • Tour d'Émilie — Infobox compétition sportive Tour d Émilie Giro dell Emilia (it) Sport cyclisme sur route Création 1909 Éditions 94 …   Wikipédia en Français

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”