Luis Walter Alvarez, American physicist and academic, Nobel Prize laureate (b. 1911)
Luis Walter Alvarez (June 13, 1911 – September 1, 1988) was an American experimental physicist, inventor, and professor who was awarded the Nobel Prize in Physics in 1968 for development of the hydrogen bubble chamber enabling discovery of resonance states in particle physics. The American Journal of Physics commented, "Luis Alvarez was one of the most brilliant and productive experimental physicists of the twentieth century."After receiving his PhD from the University of Chicago in 1936, Alvarez went to work for Ernest Lawrence at the Radiation Laboratory at the University of California, Berkeley. Alvarez devised a set of experiments to observe K-electron capture in radioactive nuclei, predicted by the beta decay theory but never before observed. He produced tritium using the cyclotron and measured its lifetime. In collaboration with Felix Bloch, he measured the magnetic moment of the neutron.
In 1940, Alvarez joined the MIT Radiation Laboratory, where he contributed to a number of World War II radar projects, from early improvements to Identification friend or foe (IFF) radar beacons, now called transponders, to a system known as VIXEN for preventing enemy submarines from realizing that they had been found by the new airborne microwave radars. Enemy submarines would wait until the radar signal was getting strong and then submerge, escaping attack. But VIXEN transmitted a radar signal whose strength was the cube of the distance to the submarine so that as they approached the sub, the signal—as measured by the sub—got progressively weaker, and the sub assumed the plane was getting farther away and didn't submerge. The radar system for which Alvarez is best known and which has played a major role in aviation, most particularly in the post war Berlin airlift, was Ground Controlled Approach (GCA). Alvarez spent a few months at the University of Chicago working on nuclear reactors for Enrico Fermi before coming to Los Alamos to work for Robert Oppenheimer on the Manhattan project. Alvarez worked on the design of explosive lenses, and the development of exploding-bridgewire detonators. As a member of Project Alberta, he observed the Trinity nuclear test from a B-29 Superfortress, and later the bombing of Hiroshima from the B-29 The Great Artiste.
After the war Alvarez was involved in the design of a liquid hydrogen bubble chamber that allowed his team to take millions of photographs of particle interactions, develop complex computer systems to measure and analyze these interactions, and discover entire families of new particles and resonance states. This work resulted in his being awarded the Nobel Prize in 1968. He was involved in a project to x-ray the Egyptian pyramids to search for unknown chambers. With his son, geologist Walter Alvarez, he developed the Alvarez hypothesis which proposes that the extinction event that wiped out the non-avian dinosaurs was the result of an asteroid impact.
Alvarez was a member of the JASON Defense Advisory Group, the Bohemian Club, and the Republican Party.
1988Sep, 1
Luis Walter Alvarez
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Events on 1988
- 14Apr
Soviet Union
In a United Nations ceremony in Geneva, Switzerland, the Soviet Union signs an agreement pledging to withdraw its troops from Afghanistan. - 29May
Ronald Reagan
The U.S. President Ronald Reagan begins his first visit to the Soviet Union when he arrives in Moscow for a superpower summit with the Soviet leader Mikhail Gorbachev. - 15Nov
State of Palestine
Israeli-Palestinian conflict: An independent State of Palestine is proclaimed by the Palestinian National Council. - 16Nov
Benazir Bhutto
In the first open election in more than a decade, voters in Pakistan elect populist candidate Benazir Bhutto to be Prime Minister of Pakistan. - 19Nov
Slobodan Milošević
Serbian communist representative and future Serbian and Yugoslav president Slobodan Milošević publicly declares that Serbia is under attack from Albanian separatists in Kosovo as well as internal treachery within Yugoslavia and a foreign conspiracy to destroy Serbia and Yugoslavia.