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 people, Carsten used to be the absolute best good friend and colleague. To Finn, he was once a fellow scholar within the historical past of technology for a number of years on the Niels Bohr Institute; to Relge, he used to be a welcome source for private and highbrow interac­ tion in an another way below fertile surroundings for the background of technological know-how; Roger used to be Carsten's good friend and consultant, now not least within the improvement of the dissertation on which the current ebook is predicated; and as director of the Niels Bohr Archive, Erik used to be his major consultant in his old 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 ebook 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. earlier than his premature demise almost immediately after the finishing touch of the Ph. D. disser­ tation, Carsten had himself plans to strengthen the dissertation right into a publication. Being a real perfectionist, he desired to remodel the manuscript substantively, particularly in regards to concerning it to the wider dialogue between historians of science.

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Questioning inhomogeneity 13 and since Otto Hahn already worked with radioactive substances, they decided to collaborate. 33 She would stay with Hahn for about thirty years. J. 34 At the outset, Hahn and Meitner questioned Bragg's result, since he had not stated whether he had used pure RaC. A possible explanation of his result was that his source had been the unseparated active deposit RaA + B + C or RaB + C. Their investigation confirmed their prejudice against Bragg's result. , an exponential absorption, which was inconsistent with Bragg's view according to which one should find a bent curve.

54 The attitude in Berlin was different, and apparently Rutherford's warning did not make any impression on Hahn and Meitner. They still had a strong belief in their working hypothesis, and were of the opinion that Wilson had misinterpreted his results. 55 First, Hahn and Meitner felt certain that the investigated rays were not homogeneous. The size of Wilson's aperture, they argued, was too large. For instance, RaC (RaC 1 + RaC 2 ), as it was then assumed, emits two very close beta rays, and they could not be separated by Wilson's arrangement.

26 (1913), 717-729. 40 2. 3: The experimental arrangement used by Rutherford and Robinson in their magnetic-deflection experiments in 1913. Like Danysz, they placed the photographic plate horizontally in the plane of the slit; but in contrast to him, they took advantage of the semicircular-focusing effect. According to this effect, electrons that begin their motion at any small angle from the normal to the plate will follow different orbits, but will all strike the photographic plate at about the same distance from the origin.

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