Angular Distributions of Conversion Electrons from Oriented Ce^137m Nuclei

Author Info

Richard B. Frankel, University of California - BerkeleyFollow
D. A. Shirley, University of California - Berkeley
N. J. Stone, University of California - Berkeley

Recommended Citation

Published in Physical Review, Volume 136, Issue 3B, November 9, 1964, pages 577-583.

NOTE: At the time of publication, the author Richard B. Frankel was not yet affiliated with Cal Poly.

The definitive version is available at https://doi.org/10.1103/PhysRev.136.B577.

Abstract

The angular distributions of K- and of (L+M)-conversion electrons from oriented Ce^137m nuclei were observed. Precise simultaneous intensity measurements of conversion electrons and γ rays from the same sample provided an accurate, direct determination of the particle parameters b₂ associated with the 255-keV isomeric transition in Ce¹³⁷. The K-electron result, b₂=1.061 (18), is in excellent agreement with a theoretical prediction based on a "point nucleus" model. Techniques and parameters in this experiment, the first of its kind, are discussed. A more careful determination of the temperature dependence of anisotropy of the 255-keV γ ray yielded the value A=0.0147 (7) cm^-1 for the hyperfine structure constant of Ce^137m in neodymium ethylsulfate. This is slightly higher than the older value of 0.0129 (12) cm^-1 found in this laboratory and is to be preferred on the basis of internal evidence. Using Bleaney's value of〈r^-3〉_4f=4.44 au, the derived magnetic moment is changed from 0.96 (09) nm to 0.89 (05) nm. Other radial integrals give different values. A possible discrepancy in the magnetic temperature scale for neodymium ethylsulfate is discussed.

Disciplines

Physics

Copyright

1964 American Physical Society.

Publisher statement

This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Physical Society. The following article appeared in Physical Review.