The atomic-beam method has been applied to the measurement of isotope shifts in the D^ line of five radioactive isotopes including the isomeric pair 134 Cs-l 34m Cs. The shifts in these lines, relative to the energy in the D t line of 133 Cs are as follows:Cs, +5.9(1.5) mK; 129 Cs, +2.8(1.5) mK; 134 Cs, +1.8(1.0) mK; 134m Cs,-2.2(1.2) mK; and ^Cs,-6.0(1.5) mK. Here a positive sign means that the frequency of the D t line for the indicated isotope is greater than that for l 3 3Cs. 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/neutroiu
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