|Died||30 December 1993 86) (aged|
|Known for||Contribution to the discovery of the pion or pi-meson decay|
|Doctoral advisor||Bruno Rossi|
Giuseppe Paolo Stanislao "Beppo" Occhialini ForMemRS [dʒuˈzɛppe okkjaˈliːni] ; 5 December 1907 – 30 December 1993) was an Italian physicist who contributed to the discovery of the pion or pi-meson decay in 1947 with César Lattes and Cecil Frank Powell, the latter winning the Nobel Prize in Physics for this work. At the time of this discovery, they were all working at the H. H. Wills Laboratory of the University of Bristol.(Italian pronunciation:
The X-ray satellite SAX was named BeppoSAX in his honour after its launch in 1996.
His father was the physicist Raffaele Augusto Occhialini (1878–1951), pioneer in the fields of spectroscopy and electronics theory. Giuseppe Paolo Stanislao Occhialini graduated at Florence in 1929. In 1932, he collaborated in the discovery of the positron in cosmic rays at the Cavendish Laboratory of Cambridge, under the leadership of Patrick Blackett, using cloud chambers. From 1937 to the 1944 he worked, on invitation of Gleb Wataghin, at the institute of physics of the University of São Paulo, in Brazil. He returned to Italy in 1944, teaching first in Genoa in 1950 and then in the physics department at the University of Milan in 1952.
In 1947, he contributed to the discovery of the pion or pi-meson decay in collaboration with César Lattes, Cecil Frank Powell and Hugh Muirhead. The discovery was made at the Wills Laboratory of Bristol using the technology of the tracks on specialized photographic emulsions. Powell won the Nobel Prize in Physics in 1950, in large part for this work.
He was a protagonist in cosmic ray research with the nuclear utilization of photographic emulsions exposed to high energy cosmic radiation, work which culminated in 1954 with the European G-Stack collaboration. Later on with the coming of particle accelerators, Occhialini explored that new field of research. He also made outstanding contributions to space physics, importantly contributing to the foundation of the European Space Agency.
Beppo Occhialini was an avid mountain climber. During WW II, staying in Brazil, then a country hostile to Italy, he became an authorized alpine guide in the Parque Nacional do Itatiaia, where there is a peak named "Pico Occhialini".
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. Each pion consists of a quark and an antiquark and is therefore a meson. Pions are the lightest mesons and, more generally, the lightest hadrons. They are unstable, with the charged pions
decaying after a mean lifetime of 26.033 nanoseconds, and the neutral pion
decaying after a much shorter lifetime of 85 attoseconds. Charged pions most often decay into muons and muon neutrinos, while neutral pions generally decay into gamma rays.
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