Atomic-Beam Measurement of Isotope Shifts in the D1 Line of Cs127, Cs129, Cs133, Cs134m, Cs134, and Cs137

Richard Marrus, Edmond C. Wang, and Joseph Yellin
Phys. Rev. 177, 122 – Published 5 January 1969
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Abstract

The atomic-beam method has been applied to the measurement of isotope shifts in the D1 line of five radioactive isotopes including the isomeric pair Cs134-Cs134m. The shifts in these lines, relative to the energy in the D1 line of Cs133 are as follows: Cs127, +5.9(1.5) mK; Cs129, +2.8(1.5) mK; Cs134, +1.8(1.0) mK; Cs134m, -2.2(1.2) mK; and Cs137, -6.0(1.5) mK. Here a positive sign means that the frequency of the D1 line for the indicated isotope is greater than that for Cs133. Evidence is presented which indicates that the observed shifts arise almost completely from nuclear effects. These shifts must therefore be compared with a calculated shift arising from the normal volume effect of 10 mK/neutron.

  • Received 31 July 1968

DOI:https://doi.org/10.1103/PhysRev.177.122

©1969 American Physical Society

Authors & Affiliations

Richard Marrus, Edmond C. Wang, and Joseph Yellin

  • Department of Physics and Lawrence Radiation Laboratory, University of California, Berkeley, California

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Vol. 177, Iss. 1 — January 1969

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