Measurement of quadrupole moment of the 134 keV level in 131Cs
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The time differential as well as time integral perturbed angular correlations of the 486-134 keV cascade in 131Cs have been studied in a polycrystalline BaSO4 powder source using a HPGe-BaF2 detector system. The fundamental quadrupole frequency for the 134 keV level has been found to be ω0= (4.4 ± 0.4) × 107 rad/s. From a comparison of the quadrupole frequencies of this level and that of the 81 keV level in 133Cs, measured earlier in the same crystalline environment of the source, the absolute value of the quadrupole moment of the 134 keV level in 131Cs has been found to be 0.022 ± 0.002 b. This value of the quadrupole moment is reported for the first time and compared with the value predicted theoretically within the unified nuclear model with intermediate coupling.
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