By Carsten Jensen (auth.), Finn Aaserud, Helge Kragh, Erik Rüdinger, Roger H. Stuewer (eds.)
To all 4 folks, Carsten was once the very best buddy and colleague. To Finn, he used to be a fellow scholar within the background of technological know-how for numerous 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 under fertile atmosphere for the background of technological know-how; Roger was once Carsten's good friend and consultant, no longer least within the improvement of the dissertation on which the current ebook relies; and as director of the Niels Bohr Archive, Erik was once his major consultant in his old paintings. simply because he was once the individual closest to Carsten's paintings on his Ph. D. dissertation at the background of beta decay, on which the current e-book relies, 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 demise presently after the of completion of the Ph. D. disser tation, Carsten had himself plans to increase the dissertation right into a ebook. Being a real perfectionist, he desired to remodel the manuscript substantively, specially in regards to referring to it to the wider dialogue between historians of science.
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Extra resources for Controversy and Consensus: Nuclear Beta Decay 1911–1934
5. 13: The apparatus used by Baeyer, Hahn and Meitner in their magneticdeflection experiments. The active wire was placed in the groove A, and B is a narrow slit through which the beta rays passed before they hit the photographic plate C. The apparatus was enclosed in the vessel P which could be evacuated. Source: Kohlrausch, "Radioaktivitat" (note 19), p. 203. The letters A, B, C and P have been added to the original figure by the author. Chapter 1. Prelude: Pre-Nuclear Years, 1900-1911 26 circular arc p is given by P= b2 (X2+ab+a2)2 + 4' 2x or, if x is small, approximately by p= ab+a 2 2x Then, from the relativistic formula E= moc 2 [ 1 -1] = )1- v2 jc 2 moc 2 [ 1+ (HPe) - 1] , moc E or v can be calculated.
3. Questioning inhomogeneity 17 2/1 12 1= t: ~16 ~O QJ (J6 l\ \ 1\ \ \ In IJ! IiN. '-.. r-- -- -- 02. 6 8 m q 01. 9: Absorption curves of beta rays from radioactinium, obtained by Hahn and Meitner in 1908. The curves were obviously made up of two exponential parts. Source: Hahn and Meitner, "Uber die Beta-Strahlen" (note 39), p. 699. method,45 Hahn and Meitner succeeded in separating RaC into two components, radium C1 and radium C 2 , where the latter was again considered to be complex. Radium B, however, seemed to be homogeneous even if the result was uncertain because of the rapid decay into radium C.
624. 4. Hahn-Meitner vs. 10: Wilson's experimental arrangement to investigate the connection between absorption and velocity of beta rays. J is the source, and E is an electroscope. The purpose of the lead screens MMM was to reduce the number of scattered beta rays entering the electroscope. The absorbing material was placed immediately below E. Source: Wilson, "Absorption" (note 47), p. 613. If the particles do not decrease in velocity in passing through matter, the curves obtained in this case connecting ionisation with strength of magnetic field should fall on band c.
Controversy and Consensus: Nuclear Beta Decay 1911–1934 by Carsten Jensen (auth.), Finn Aaserud, Helge Kragh, Erik Rüdinger, Roger H. Stuewer (eds.)