Abstract
The isotope shifts of the resonance line λ = 8521 A ̊ of 131Cs, 132Cs, and 136Cs with respect to 133Cs were determined by a new scanning technique to be v ̃ ( 133 Cs)- v ̃ ( 131 Cs) = +1.70(40) mK , v ̃ ( 133 Cs)- v ̃ ( 132 Cs) = −0.95(80) mK , v ̃ ( 136 Cs)- v ̃ ( 133 Cs) = −4.0(3.0) mK . In accordance with results from other Cs isotopes and neighbouring elements they show the change 〈 δr 2〉 in the second radial moment of the nuclear charge distribution to be a factor of 5 to 10 smaller than expected from the model of uniform charge distribution. Integral isotope shifts over the isotopic chains of Xe, Cs, and Ba were analyzed in terms of collective models. Assuming an isotopic shift discrepancy of 0.5 for the nuclear volume shift it was possible to derive deformation parameters 〈β 2〉 1 2 in quantitative agreement with those from B(E2) measurements.
Published Version
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