Bruno Pontecorvo russian: Бруно Понтекорво (Marina di Pisa, Italy,
August 22, 1913- Dubna, Russia, September 24, 1993) was an Italian-born atomic physicist, an early assistant of Enrico Fermiand then the author of numerous studies in high energy physics, especially on neutrinos. He became notorious, even outside the scientific community, because of his voluntary move to the USSRin 1950, where he continued his research on the decay of the muonand on neutrinos. The prestigious Pontecorvo Prizewas instituted in his memory in 1995.
Pontecorvo was born in
Pisainto a wealthy non-observant Italian Jewish family. At only 18 he was admitted to the Course of Physics held by Enrico Fermiat the University of Rome "La Sapienza", becoming one of the closest (and the youngest) assistants of Fermi and one of the so-called Via Panisperna boys(as Fermi's group of scientists is often called, after the name of the street where their laboratory was situated).
In 1934 he contributed to Fermi's famous experiment showing the properties of slow
neutronsthat led the way to the discovery of nuclear fission.
In 1936 he moved to
Paristo work in the laboratory of Irène and Frédéric Joliot-Curieon the effects of collisions of neutrons with protons and on the electromagnetic transitions among isomers. During this period he was influenced by the ideas of socialismto which he remained loyal for the rest of his life. In Paris, in 1938, he formed a relationship with Marianne Nordblom, a young student of French Literature, and their first son was born during that year.
Pontecorvo was unable to return to Italy because of the
fascistregime's racial discriminationagainst the Jews. He remained in Paris until the Nazisentered the city, then fled with his family to Spainand shortly after to the USA, where he had found employment with an oil company in Tulsa, Oklahoma. While at the oil company he developed a technology and an instrument for "well logging", based on the properties of neutrons. This technology may be considered the first practical application of the "Via Panisperna boys' "discovery of slow neutrons.
He was not called upon to participate in the
Manhattan Projectin the USA for the construction of the atomic bomb, possibly because of his committed socialist beliefs. But in 1943 he was invited to join the associated Montreal Laboratoryin Canada, where he concentrated on reactor design, cosmic rays, neutrinos and the decay of muons.
In 1948, after he obtained British citizenship, he was invited by
John Cockcroftto contribute to the British atomic bomb project at AERE, Harwell where he joined the Nuclear Physics Division under Egon Bretscher. In 1950 he was appointed to the chair of physics at the University of Liverpoolwhich he was due to take up in January, 1951.
August 31, 1950, in the middle of a holiday in Italy, he abruptly left Romefor Stockholmwith his wife and three sons without informing friends or relatives. The next day he was helped by Soviet agents to enter the USSRfrom Finland. His abrupt disappearance caused much concern to many of the western intelligence services, especially those of Britain and the USA who were worried about the escape of atomic secrets to the Soviet Unionafter the then recent case of Klaus Fuchs. But as was pointed out immediately, Pontecorvo had had only limited access to "secret subjects" and even later no allegation of spying or of transferring of secrets to the Soviets has ever been made against him.
In the USSR Pontecorvo was welcomed with honor and given a number of privileges reserved only to the Soviet nomenclatura. He worked until his death in what is now the
Joint Institute for Nuclear Research(JINR) in Dubna, concentrating entirely on theoretical studies of high energy particles and continuing his research on neutrinos and decay of muons. In recognition of his research he was awarded the Stalin Prizein 1953, membership of the Soviet Academy of Sciencesin 1958 and two Orders of Lenin. In 1955 he appeared to the world in public at a press conference where he explained to the world the motivations of his choice to leave the West and work in the USSR. Pontecorvo did not leave the Soviet Union for many years, the first trip being in 1978 when he travelled to Italy.
He died in
Dubnain 1993, afflicted by Parkinson's disease. He is now buried in the Protestant Cemeteryin Rome.
In 1995, in recognition of his scientific merits, the prestigious
Pontecorvo Prizehas been instituted by the Joint Institute for Nuclear Research. The prize, awarded annually to an individual scientist, recognizes "the most significant investigations in elementary particle physics", as acknowledged by the international scientific community.
The scientific work of Bruno Pontecorvo is full of formidable intuitions, some of which have represented milestones in modern physics. These include:
*the intuition of how to detect anti-neutrinos generated in nuclear reactors (methodology used by Frederick Reines who was awarded for this with the
Nobel prizein 1995);
*the prediction that neutrinos associated with electrons are different from those associated with muons (for experimental verification of this another Nobel prize was awarded to J. Steinberger, L. Lederman and M. Schwartz in 1988);
*the idea that neutrinos may convert into other type of neutrinos, a phenomenon known as
neutrino oscillation. This last idea was proposed in 1957 and developed in the subsequent years by Pontecorvo, till 1967 where it was given the modern form. This phenomenon was first seen with solar neutrinos in 1968 and recently and was recently confirmed by several other experiments, but it is not recognized by a Nobel prize yet (the prize awarded to Masatoshi Koshibaand Ray Davis in 2002 regards neutrino astronomy).
*Bruno Pontecorvo was brother to film director
Gillo Pontecorvoand Guido Pontecorvo, the geneticist.
*cite journal|title=Neutron Well Logging - A New Geological Method Based on Nuclear Physics|journal=Oil and Gas Journal|year=1941|volume=40|pages=32–33
* Pages in the Development of Neutrino Physics, Usp.Fiz.Nauk 141, 1983, 675 [English ed. Sov.Phys.Usp.26, 1983, 1087]
*cite book|first=Miriam|last=Mafai|title=Il lungo freddo: Storia di Bruno Pontecorvo, lo scienziato che scelse l'URSS|location=
solar neutrino problem
Sudbury Neutrino Observatory
* [http://pontecorvo.jinr.ru/ Biography / Scientific Works / Popular Articles / About B. Pontecorvo / Photoalbum] (in English and Russian)
* [http://news.bbc.co.uk/onthisday/hi/dates/stories/october/27/newsid_3091000/3091390.stm 1950's news of Pontecorvo's disappearance] from the
Wikimedia Foundation. 2010.
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