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Improvements in the precision of beta-ray spectroscopy

DuMond, Jesse W. M. (1952) Improvements in the precision of beta-ray spectroscopy. Physics Today, 5 (12). pp. 10-13. ISSN 0031-9228. doi:10.1063/1.3067417.

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The direct measurement of gamma‐rays only yields about half the picture in the study of nuclear energy levels. The other, and indeed to most physicists more familiar, half concerns the β‐rays, including in this term both the continuous β‐ray spectrum and the line spectrum by “conversion”, either internal or external. Ever since 1948, therefore, we have been much occupied with the design and construction along rather novel lines of a high precision helical focusing magnetic β‐ray spectrometer planned as a companion instrument to the crystal diffraction spectrometer as regards absolute precision and accuracy. We have only very recently completed this instrument and made the first tests on it which indicate that it will meet all our expectations both as to high absolute accuracy and high luminosity and sensitivity to weak sources. The beta‐ray spectrometer discussed in the following pages has recently been completed at the California Institute of Technology. It is shown in cross section on the cover.

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Additional Information:© 1952 American Institute of Physics. This is the second of two articles based on an invited paper presented before the American Physical Society last May. The first, under the title Higher Precision in Nuclear Spectroscopy, appeared on page 13 of last month's issue.
Issue or Number:12
Record Number:CaltechAUTHORS:20140621-164718597
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46421
Deposited By: George Porter
Deposited On:23 Jun 2014 16:00
Last Modified:10 Nov 2021 17:25

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