Cesare Mansueto Giulio Lattes
11 July 1924
|Died||8 March 2005 80) (aged|
|Alma mater||University of São Paulo|
|Known for||Discovery of the pion|
Cesare Mansueto Giulio Lattes (11 July 1924 – 8 March 2005), also known as César Lattes, was a Brazilian experimental physicist, one of the discoverers of the pion, a composite subatomic particle made of a quark and an antiquark.
Lattes was born to a family of Jewish Italian immigrants in Curitiba, Paraná Brazil. He did his first studies there and also in São Paulo. He then went to the University of São Paulo, graduating in 1943, in mathematics and physics. He was part of an initial group of young Brazilian physicists who worked under European teachers such as Gleb Wataghin and Giuseppe Occhialini. Lattes was considered the most brilliant of those and was noted at a very young age as a bold researcher. His colleagues, who also became important Brazilian scientists, were Oscar Sala, Mário Schenberg, Roberto Salmeron, Marcelo Damy de Souza Santos and Jayme Tiomno. At the age of 25, he was one of the founders of the Brazilian Center for Physical Research (Centro Brasileiro de Pesquisas Físicas) in Rio de Janeiro.
From 1947 to 1948, Lattes launched on his main research line by studying cosmic rays. He visited a weather station on top of the 5,200-meter high Chacaltaya mountain in Bolivia, using photographic plates to register the rays. Travelling to England with his teacher Occhialini, Lattes went to work at the H. H. Wills Laboratory of the University of Bristol, directed by Cecil Powell. There, he improved on the nuclear emulsion used by Powell by adding more boron to it. In 1947, he made his great experimental discovery with Powell: the pion (or pi meson). Lattes then proceeded to write a paper for Nature without bothering to ask for Powell's consent. In the same year, he was responsible for calculating the new particle's mass. A year later, working with Eugene H. Gardner (1913-1950) at UC Berkeley, Lattes was able to detect the artificial production of pions in the lab's cyclotron, by bombarding carbon atoms with alpha particles. He was just 24 years old.
In 1949, Lattes returned as a professor and researcher with the Federal University of Rio de Janeiro and the Brazilian Center for Physical Research. After another brief stay in the United States (from 1955 to 1957), he returned to Brazil and accepted a position at his alma mater, the Department of Physics of the University of São Paulo.
In 1967, Lattes accepted a position of full professor with the new "Gleb Wataghin" Institute of Physics at the State University of Campinas (Unicamp), which he helped to found. He became also the chairman of the Department of Cosmic Rays, Chronology, High Energies and Leptons. In 1969, he and his group discovered the mass of the so-called fireballs, a phenomenon induced by naturally occurring high-energy collisions, and which was detected by means of special lead-chamber nuclear emulsion plates invented by him, and placed at the Chacaltaya peak of the Bolivian Andes.
Lattes retired in 1986, when he received from the Unicamp the titles of doctor honoris causa and professor emeritus. After retirement he continued to live in a house in the suburban area very near to the University's campus. He died of a heart attack on March 8, 2005 in Campinas, São Paulo.
Lattes is one of the most distinguished and honored Brazilian physicists, and his work was fundamental for the development of atomic physics. He was also a great scientific leader of Brazilian Physics and was one of the main personalities behind the creation of the important Brazilian National Research Council (Conselho Nacional de Desenvolvimento Científico e Tecnológico). Due to his contribution in this process, the Brazilian national science data-base, Lattes Platform was named after him.
He figures as one of the few Brazilians in Isaac Asimov's Biographical Encyclopedia of Science and Technology , as well as in the Encyclopædia Britannica . Although he was the main researcher and the first author of the historical Nature article describing the pion, Cecil Powell alone was awarded the Nobel Prize for Physics in 1950 for "his development of the photographic method of studying nuclear processes and his discoveries regarding mesons made with this method". The reason for this apparent neglect is that the Nobel Committee policy until 1960 was to give the award to the research group head, only. He received the TWAS Prize in 1987.After his death UNICAMP decided to give his name to the central library.
Gilberto Gil's Grammy-winning 1998 album Quanta includes a song dedicated to Lattes, called "Ciência e Arte".
In particle physics, mesons are hadronic subatomic particles composed of one quark and one antiquark, bound together by strong interactions. Because mesons are composed of quark subparticles, they have physical size, notably a diameter of roughly one femtometer (1×10−15 m), which is about 1.2 times the size of a proton or neutron. All mesons are unstable, with the longest-lived lasting for only a few hundredths of a microsecond. Charged mesons decay to form electrons and neutrinos. Uncharged mesons may decay to photons. Both of these decays imply that color is no longer a property of the byproducts.
In particle physics, a pion is any of three subatomic particles:
. 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 84 attoseconds. Charged pions most often decay into muons and muon neutrinos, while neutral pions generally decay into gamma rays.
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