Otto Hahn and the Rise of Nuclear Physics

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W. R. Shea
Springer Science & Business Media, 31 ago. 1983 - 252 páginas
and less as the emanation unden\'ent radioactive decay, and it became motion less after about 30 seconds. Since this process was occurring very rapidly, Hahn and Sackur marked the position of the pointer on a scale with pencil marks. As a timing device they used a metronome that beat out intervals of approximately 1. 3 seconds. This simple method enabled them to determine that the half-life of the emanations of actinium and emanium were the same. Although Giesel's measurements had been more precise than Debierne's, the name of actinium was retained since Debierne had made the discovery first. Hahn now returned to his sample of barium chloride. He soon conjectured that the radium-enriched preparations must harbor another radioactive sub stance. The liquids resulting from fractional crystallization, which were sup posed to contain radium only, produced two kinds of emanation. One was the long-lived emanation of radium, the other had a short life similar to the emanation produced by thorium. Hahn tried to separate this substance by adding some iron to the solutions that should have been free of radium, but to no avail. Later the reason for his failure became apparent. The element that emitted the thorium emanation was constantly replenished by the ele ment believed to be radium. Hahn succeeded in enriching a preparation until it was more than 100,000 times as intensive in its radiation as the same quantity of thorium.
 

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Índice

FROM RUTHERFORD TO HAHN
1
THE NUCLEAR ELECTRON HYPOTHESIS
19
NUCLEAR PHYSICS COSMIC RAYS AND ROBERT MILLIKANS RESEARCH PROGRAM
69
THE DISCOVERY OF FISSION AND A NUCLEAR PHYSICS PARADIGM
91
5 INTERNAL AND EXTERNAL CONDITIONS FOR THE DISCOVERY OF NUCLEAR FISSION BY THE BERLIN TEAM
135
OTTO HAHN SCIENCE AND SOCIAL RESPONSIBILITY
167
THE POLITICS OF BRITISH SCIENCE IN THE MUNICH ERA
181
WHY HAHNS RADIOTHORIUM SURPRISED RUTHERFORD IN MONTREAL
201
THE FIRST EXAMPLE OF NUCLEAR ISOMERISM
213
NUCLEAR PHYSICS IN CANADA IN THE 1930s
221
INDEX
241
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Sobre el autor (1983)

William R. Shea graduated from the University of Cambridge. He taught at the University of Ottawa, McGill University, and the University of Strasbourg before joining the faculty at the University of Padua in 2003. He is the author, co-author or editor of over 30 books including Galileo's Intellectual Revolution and The Magic of Numbers and Motion: The Scientific Career of René Descartes. His book Designing Experiments and Games of Chance: The Unconventional Science of Blaise Pascal won the Library Association Award as one of the outstanding academic books of 2003.

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