Abstract
The magnetic moment of the 161 keV state of 133 Cs was remeasured by the 1PAC technique in an external magnetic field of 9.5 T as μ I(161keV) = 2.0(2)n.m. The known half-life of the 161 keV state, T 1/2 = 190(15)ps, was confirmed by a Coulomb-excitation experiment. The 161 keV state as well as the few other states for which large B(E2)↑ values are observed exhibit the characteristic properties of a ground state core-excitation multiplet as proposed by de-Shalit. A high precision remeasurement of the 276 keV–161 keV γ-γ angular correlation by use of a three Ge(Li) detector system gave A 2 = −0.495(5) and A 4 = −0.54(6), and confirms the result obtained by Winn and Sarantites which is in contradiction to all previous data. A comparison of the M1/E2 mixing ratio derived from this angular correlation for the 161 keV transition with recent precise data for the total conversion coefficient proves that anomalous conversion is present and leads to the penetration parameter λ = +25(9).
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