Measurement of quadrupole moment of the 134 keV level in $^{131}$Cs

C.C. Dey; B.K. Sinha; S.K. Das

doi:doi:10.1007/PL00013595

EPJ

Measurement of quadrupole moment of the 134 keV level in ¹³¹Cs

C.C. Dey¹ - B.K. Sinha¹ - S.K. Das²

¹ Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Calcutta - 700 064, India
² Variable Energy Cyclotron Centre, 1/AF Bidhannagar, Calcutta - 700 064, India

Received: 21 October 1999 / Revised version: 22 December 1999 Communicated by D. Schwalm

Abstract
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 $\omega$ ₀ = (4.4 $\pm$ 0.4) x10⁷ 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 $\pm$ 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.

PACS
23.20.En Angular distribution and correlation measurements - 21.10.Ky Electromagnetic moments - 27.60.+j $90 \leq A \leq 149$

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EPJ

Measurement of quadrupole moment of the 134 keV level in 131Cs

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Measurement of quadrupole moment of the 134 keV level in ¹³¹Cs