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Absence of Dispersive Properties of Space for Electromagnetic Radiation Tested to ± 14 x 10^-5; Comments on a Proposal of Softky and Squire

DuMond, Jesse W. M. (1961) Absence of Dispersive Properties of Space for Electromagnetic Radiation Tested to ± 14 x 10^-5; Comments on a Proposal of Softky and Squire. Proceedings of the National Academy of Sciences of the United States of America, 47 (3). pp. 347-348. ISSN 0027-8424. http://resolver.caltech.edu/CaltechAUTHORS:DUMpnas61

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Abstract

In session I 1 of the Berkeley meeting of December 30, 1960, S. D. Softky and R. K. Squire proposed a test for dispersive properties of space for electromagnetic radiation by detonating a nuclear explosive at a distance of 10^6 miles from the earth and noting the arrival times of different types of radiation at detectors above the atmosphere. The purpose of this note is to point out that Softky and Squire have overlooked the fact that a test for the dispersive properties they postulate already exists, covering perhaps not quite as extensive a range of the electromagnetic spectrum as they hope to cover (they claim a factor of 10^11) but nevertheless sufficient to render any such effect extremely unlikely over a range of frequencies of a factor of 5 X 10^9. I refer to a measurement performed in 1950 by means of the bent quartz crystal diffraction spectrometer [1] of the wavelength of the annihilation radiation generated in a block of copper by positrons from the nuclide 64Cu.


Item Type:Article
Additional Information:Copyright © 1961 by the National Academy of Sciences Communicated January 17, 1961 Work performed under the auspices of the U.S. Atomic Energy Commission.
Record Number:CaltechAUTHORS:DUMpnas61
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:DUMpnas61
Alternative URL:http://www.pnas.org/content/vol47/issue3/
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6180
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:28 Nov 2006
Last Modified:26 Dec 2012 09:18

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