Degree Type
Thesis
Date of Award
1964
Degree Name
Master of Science
Department
Physics and Astronomy
Major
Physics
Abstract
Important information concerning the multipolarity, spin, and parity changes in a nuclear transition may be obtained by comparing experimentally measured internal conversion coefficients with those theoretically predicted (1). In determining these conversion coefficients by taking the ratio of the number of internal conversion electrons emitted to the number of emitted gamma rays for a given transition, the gamma ray intensities usually have the largest error. Internal conversion line intensities may be measured using a magnetic spectrometer wit.h an error of one or two percent while the gamma-ray intensities are frequently in error from five to ten percent or more. Since the theoretical calculations of internal conversion coefficients are estimated to be accurate to about five percent, it is desirable to measure internal conversion coefficients with an error of not more than five percent for a meaningful comparison. Thus a means must be found to reduce the uncertainty in the gamma-ray intensity measurements. It is usually sufficient to measure relative intensities and then to compute relative internal conversion coefficients. ·By a suitable normalization procedure absolute internal conversion coefficients may be obtained.
DOI
https://doi.org/10.31274/rtd-180813-7540
Publisher
Digital Repository @ Iowa State University, http://lib.dr.iastate.edu
Copyright Owner
Joseph Emerson Brown
Copyright Date
1964
Language
en
Date Available
December 20, 2012
File Format
application/pdf
Recommended Citation
Brown, Joseph Emerson, "A computer method for determining by least squares gamma ray relative intensities using a bent-crystal monochromator" (1964). Retrospective Theses and Dissertations. 11.
https://lib.dr.iastate.edu/rtd/11
