Download Controversy and Consensus: Nuclear Beta Decay 1911–1934 by Carsten Jensen (auth.), Finn Aaserud, Helge Kragh, Erik PDF

By Carsten Jensen (auth.), Finn Aaserud, Helge Kragh, Erik Rüdinger, Roger H. Stuewer (eds.)

To all 4 folks, Carsten used to be the very best pal and colleague. To Finn, he used to be a fellow pupil within the heritage of technological know-how for a number of years on the Niels Bohr Institute; to Relge, he was once a welcome source for private and highbrow interac­ tion in an differently below fertile surroundings for the historical past of technology; Roger was once Carsten's buddy and consultant, no longer least within the improvement of the dissertation on which the current booklet is predicated; and as director of the Niels Bohr Archive, Erik used to be his major consultant in his historic paintings. simply because he used to be the individual closest to Carsten's paintings on his Ph. D. dissertation at the heritage of beta decay, on which the current booklet is predicated, it's only becoming that Erik stands as unmarried writer of the phrases in Carsten's reminiscence on the very starting of this ebook. prior to his premature loss of life almost immediately after the crowning glory of the Ph. D. disser­ tation, Carsten had himself plans to enhance the dissertation right into a ebook. Being a real perfectionist, he desired to remodel the manuscript substantively, in particular in regards to bearing on it to the wider dialogue between historians of science.

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24Soddy, "Intra-Atomic Charge" (note 14), p. 400. 4. ,,25 Uranium and thorium salts are very similar in chemical character, but recent experiments had shown that they are separable from one another by chemical methods. Thus the conclusion was that the nucleus must contain electrons - at least six in the case of uranium to account for the six beta rays expelled in its decay chain. That the disintegration electron originates in the nucleus became evident during 1913. That does not mean, however, that all the beta rays emitted from radioactive substances necessarily come from the nucleus.

289328, on pp. J. , 1975), pp. 300-301. L. Add. MS. L. Add. MS. 7653 R30. H. R. ) (Dordrecht: Reidel, 1983), pp. 19-67, on p. 21. 34 2. The Rutherford Era, 1911-1919 By use of this idea I believe I shall be able to explain the Periodic Law and the valency question in general. 14 As is evident from a letter of 31 December 1913 to Rutherford, Niels Bohr's theory was required to convince Fajans of the justice of the nuclear atom: I have followed Bohr's papers with extraordinary interest, and now I no longer doubt the complete correctness of your atomic theory.

Questioning inhomogeneity Concerning the cause of the straight absorption curves, however, they agreed with Schmidt "that the velocity of the beta rays would not change when they passed through matter. ,,38 Hahn and Meitner continued their work and investigated beta rays from actinium with the purpose of examining whether the validity of the exponential law for uniform beta rays could be established also for actinium. 8) presented two deviations from the exponential law: the first and the last part of the curve showed a too strong absorption.

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