Elsevier

Nuclear Physics A

Volume 270, Issue 1, 12 October 1976, Pages 189-199
Nuclear Physics A

Angular correlation measurements in 131Xe

https://doi.org/10.1016/0375-9474(76)90134-2Get rights and content

Abstract

An experiment is described determining the angular correlations of five γ-γ cascades in 131Xe appearing in the decay of 131I. Using a 12-channel goniometer the following results were obtained: 325.8–177.2 keV, A2 = 0.018(11), A4 = −0.003(10); 318.1–404.8 keV, A2 = −0.18(4), A4 = −0.05(3); 272.5–364.5 keV, A2 = 0.15(4), A4 = −0.03(3); 284.3–80.2 keV, A2 = −0.005(7), A4 = 0.005(15); 318.1–324.6 keV, A2 = 0.24(5), A4 = −0.01(5). The result for the 318.1–324.6 keV cascade has not been corrected for a small influence from the 318.1–404.8 keV cascade. Four E2/M1 mixing ratios are deduced from the angular correlation coefficients (energies in keV): −0.28 ≦ δ(325.8) ≦ t̄0.20, −0.19 ≦ δ(318.1) ≦ −0.035, −1.5 ≦ δ (324.6) ≦ −0.05, δ(272.5) = −0.38(17). Transition strengths and limits to transition strengths are calculated for several transitions. The properties of negative parity states in 131Xe are investigated theoretically in a model where three neutron holes in the h112 orbit are coupled to the quadrupole vibrations of the even core. The experimental energies of the lowest negative parity states and the strengths of the transitions between these states are very well accounted for by the calculation.

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