- Lederman , Leon Max
- (1922–) American physicistThe son of Russian immigrants, Lederman was born in New York and educated at City College there. After three years with the US Signal Corps during the war, he went to Columbia where he gained his PhD in 1951. He was appointed professor of physics in 1958 and remained at Columbia until 1979, when he accepted the directorship of the Fermi National Accelerator Laboratory, Batavia, Illinois, a post he held until his retirement in 1989.In 1959 T. D. Lee asked his Columbia colleagues Lederman,Melvin Schwartz (1932––sp;–sp;), and Jack Steinberger(1921––sp;–sp;) if it was possible to study the weak fundamental interaction at high energies. While well understood at low energies, Lee noted, theories of weak interactions at high energies led to absurdities. Yet it was difficult to explore the interaction experimentally, for at high energies other forces tended to obscure all other reactions.Lederman and his coworkers began to investigate decay processes that lead to neutrinos. These proceed by a weak interaction, and there are two processes in which they can occur. In one, pions decay to give muons and neutrinos. The other, beta decay, is decay of a neutron to give a proton, an electron, and a neutrino.In what has become known as the two-neutrino experiment, the team investigated the question of whether the two types of neutrino were identical – whether the muon neutrino was the same particle as the electron neutrino. The experiment was difficult since neutrinos have a very low probability of interacting with matter. It required an intense beam of high-energy neutrinos and a large detector to have any chance of yielding a measurable number of events.Using the Alternating Gradient Synchrotron at Brookhaven, a beam of 1011 protons per second were directed with an energy of 30 billion electronvolts (30 GeV) at a beryllium target. This produced a large number of pions, which rapidly decay into muons and neutrinos. The muons were filtered out by a steel barrier 44-feet thick built from the plates of an old battleship. The neutrinos passed through untouched into a ten-ton aluminum detector. The experiment ran for ten days and diverted 1014 high-energy neutrinos through the detector. If there was only one type of neutrino it should react in the experiment with neutrons to produce an equal number of muons and electrons; if, however, the experiment produced a unique muon-linked neutrino, only muons should be created. Fifty-one neutrino collisions were recorded by the detector; all produced muons and none an electron.For this work Lederman and his Columbia colleagues Schwartz and Steinberger shared the 1988 Nobel Prize for physics.In 1977 Lederman led another team that made a second fundamental discovery. Working with the Fermilab accelerator they discovered a new particle nine times heavier than the proton. It was named the upsilon particle and provided the first evidence of the fifth quark – the so-called ‘bottom quark’. Lederman has given a popular account of particle physics in his 1992 book The God Particle (the title refers to the Higgs boson).Lederman was a key figure in the campaign to build a superconducting super collider (SSC), the giant accelerator which would supposedly finally detect the Higgs boson. To further the project Lederman made a ten-minute video for President Reagan to explain what they hoped to achieve. On the strength of the video, Reagan agreed to back the SSC. A later administration, however, decided in 1993 that the planned expenditure of $8 billion could not be supported and canceled the project.
Scientists. Academic. 2011.
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Lederman, Leon Max — Lederman , Leon Max … Scientists
LEDERMAN, LEON MAX — (1922– ), U.S. Nobel laureate in physics. Lederman was born in New York City, where he earned his B.S. at the College of the City of New York (1943), and his M.A. (1948) and Ph.D. (1951) in physics from Columbia University, an education… … Encyclopedia of Judaism
Lederman, Leon Max — ▪ American physicist born July 15, 1922, New York, N.Y., U.S. American physicist who, along with Melvin Schwartz (Schwartz, Melvin) and Jack Steinberger (Steinberger, Jack), received the Nobel Prize for Physics in 1988 for their joint… … Universalium
Leon Max Lederman — (* 15. Juli 1922 in Buffalo, New York) ist ein US amerikanischer Physiker. Lederman studierte am City College of New York (Bachelor 1943) und an der Columbia University, wo er nach dem Wehrdienst 1943 bis 1946 als … Deutsch Wikipedia
Leon Max Lederman — Leon M. Lederman Nacimiento 15 de julio de 1922 (89 años) New York Nacionalidad Estados Unidos … Wikipedia Español
Physiknobelpreis 1988: Leon Max Lederman — Melvin Schwartz — Jack Steinberger — Die Amerikaner wurden für ihre grundlegenden Experimente über Neutrinos schwach wechselwirkende Elementarteilchen mit verschwindender oder sehr kleiner Ruhemasse ausgezeichnet. Biografien Leon Max Lederman, * … Universal-Lexikon
Leon Lederman — Leon Max Lederman Leon Max Lederman (* 15. Juli 1922 in Buffalo, New York) ist ein US amerikanischer Physiker. Lederman erhielt 1988 zusammen mit Melvin Schwartz und Jack Steinberger den Nobelpreis für Physik „für ihre grundlegenden Experime … Deutsch Wikipedia
Leon M. Lederman — Leon Max Lederman Leon Max Lederman (* 15. Juli 1922 in Buffalo, New York) ist ein US amerikanischer Physiker. Lederman erhielt 1988 zusammen mit Melvin Schwartz und Jack Steinberger den Nobelpreis für Physik „für ihre grundlegenden Experime … Deutsch Wikipedia
Leon Ledermann — Leon Max Lederman Leon Max Lederman (* 15. Juli 1922 in Buffalo, New York) ist ein US amerikanischer Physiker. Lederman erhielt 1988 zusammen mit Melvin Schwartz und Jack Steinberger den Nobelpreis für Physik „für ihre grundlegenden Experime … Deutsch Wikipedia
Leon M. Lederman — Leon Lederman Pour les articles homonymes, voir Lederman. Leon Max Lederman, né à New York le 13 juillet 1922, est un physicien américain, prix Nobel de physique en 1988 pour ses travaux sur les neutrinos. Biographie Il étudie au City College de… … Wikipédia en Français