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Thoughts on the development of 20th century physics
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Implications about the neutrino masses
Hans Bethe
Scientist
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Views | Duration | |
|---|---|---|---|
| 151. The SAGE experiment | 271 | 02:57 | |
| 152. Pleasing results from the experiments | 183 | 01:39 | |
| 153. Looking forward to the Sudbury Neutrino Observatory experiment | 230 | 02:56 | |
| 154. The Sudbury Neutrino Observatory experiment | 195 | 01:22 | |
| 155. Implications about the neutrino masses | 255 | 01:27 | |
| 156. Thoughts on the development of 20th century physics | 593 | 02:38 | |
| 157. Subatomic phenomena; quarks and gluons | 489 | 02:40 | |
| 158. Physics in the future | 943 | 03:29 |
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The theory as originally formulated by Wolfenstein gives you a connection between the neutrino mass and this process. And when you use all the existing experiments on solar neutrinos you can deduce that the mass of the µ-neutrino, assuming the µ-neutrino is the heavier one, that that mass is about 3 milli electron volts, that is three one-thousandths of an electron volt; as compared to the electron mass which is 500,000 electron volts. So the electron mass is then... some 100 million times bigger than the neutrino mass. That is... would be satisfactory, and this would be... this would be the best way to get access to the neutrino mass.
The late German-American physicist Hans Bethe once described himself as the H-bomb's midwife. He left Nazi Germany in 1933, after which he helped develop the first atomic bomb, won the Nobel Prize in Physics in 1967 for his contribution to the theory of nuclear reactions, advocated tighter controls over nuclear weapons and campaigned vigorously for the peaceful use of nuclear energy.
Title: Implications about the neutrino masses
Listeners: Sam Schweber
Silvan Sam Schweber is the Koret Professor of the History of Ideas and Professor of Physics at Brandeis University, and a Faculty Associate in the Department of the History of Science at Harvard University. He is the author of a history of the development of quantum electro mechanics, "QED and the men who made it", and has recently completed a biography of Hans Bethe and the history of nuclear weapons development, "In the Shadow of the Bomb: Oppenheimer, Bethe, and the Moral Responsibility of the Scientist" (Princeton University Press, 2000).
Tags: Mikheyev–Smirnov–Wolfenstein effect, Lincoln Wolfenstein
Duration: 1 minute, 28 seconds
Date story recorded: December 1996
Date story went live: 24 January 2008
