10 April 1935|
|Died||16 August 2010
|Institutions||Italian National Institute of Nuclear Physics
Pontifical Academy of Sciences
|Known for||Cabibbo angle|
|Notable awards||Sakurai Prize (1989)
Matteucci Medal (2002)
P.A.M. Dirac Medal (2010)
Nicola Cabibbo (10 April 1935 – 16 August 2010) was an Italian physicist, best known for his work on the weak interaction. He was also the president of the Italian National Institute of Nuclear Physics from 1983 to 1992, and from 1993 until his death he was the president of the Pontifical Academy of Sciences. He was born in Rome.
Cabibbo's major work on the weak interaction originated from a need to explain two observed phenomena:
- The transitions between up and down quarks, between electrons and electron neutrinos, and between muons and muon neutrinos had similar likelihood of occurring (similar amplitudes); and
- The transitions with change in strangeness had amplitudes equal to one fourth of those with no change in strangeness.
Cabibbo solved the first issue by postulating weak universality, which involves a similarity in the weak interaction coupling strength between different generations of particles. He solved the second issue with a mixing angle θC (now called the Cabibbo angle), between the down and strange quarks. Modern measurements show that θC = 13.04°.
Before the discovery of the third generation of quarks, Cabibbo's work was extended by Makoto Kobayashi and Toshihide Maskawa to the Cabibbo–Kobayashi–Maskawa matrix. In 2008, Kobayashi and Maskawa shared one half of the Nobel Prize in Physics for their work. Some physicists had bitter feelings that the Nobel Prize committee failed to reward Cabibbo for his part. Asked for a reaction on the prize, Cabibbo preferred to give no comment. According to sources close to him, he was very embittered.
Recent work on evaluating the importance of scientific papers using Google's PageRank algorithm identifies Cabibbo's paper "Unitary symmetry and leptonic decays" as the top ranked out of 353,268 articles published by the American Physical Society since 1893 in journals such as Physical Review Letters. The same research shows that most of the authors of the top-ranked papers are also Nobel Prize winners, which makes Cabibbo's exclusion seem all the more curious.
Cabibbo supported attempts to rehabilitate executed Italian philosopher Giordano Bruno, citing the apologies on Galileo Galilei as a possible model to correct the historical wrongs done by the Church.
He died from respiratory problems in a Rome hospital on August 16, 2010 at the age of 75.
- "Morto il fisico Cabibbo Gli fu negato il Nobel". Corriere della Sera. 16 August 2010. Retrieved 2010-08-16. (Italian)
- Maiani, L. (2010). "Obituary: Nicola Cabibbo (1935–2010)". Nature 467 (7313): 284. doi:10.1038/467284a. PMID 20844530.
- Valerie Jamieson (7 October 2008). "Physics Nobel snubs key researcher". New Scientist. Retrieved 2009-11-06.
- "Nobel, l'amarezza dei fisici italiani". Corriere della Sera. 7 October 2008. Retrieved 2009-11-06. (Italian)
- Nicola Cabibbo (1963). "Unitary symmetry and leptonic decays". Physical Review Letters 10 (12): 531–533. Bibcode:1963PhRvL..10..531C. doi:10.1103/PhysRevLett.10.531.
- "How Google’s PageRank predicts Nobel Prize winners". 21 January 2009. Retrieved 2009-11-06.
- "Un scientifique évoque la réhabilitation d'un théologien brûlé pour hérésie". (French)
- "Benjamin Franklin Medal in Physics". Franklin Institute. 2011. Retrieved December 23, 2011.
|Wikiquote has a collection of quotations related to: Nicola Cabibbo|
- Cabibbo biography from the Istituto e Museo di Storia della Scienza (Italian)
- Parisi, Giorgio (2011). "Nicola Cabibbo". Physics Today 64 (2): 59. Bibcode:2011PhT....64b..59P. doi:10.1063/1.3554322.
|Catholic Church titles|
Giovanni Battista Marini Bettòlo Marconi
|President of the Pontifical Academy of Sciences
6 April 1993 – 16 August 2010