ON-LINE PERTURBED ANGULAR CORRELATION STUDIES WITH THE SHORT LIVED 127CS PROBE

Abstract On-line Perturbed Angular Correlation (PAC) experiments were performed on the 66.0 keV excited state of 127 Cs, using the γ (114.7 keV)–e − L (66.0 keV) cascade from the decay of the short-lived 127 Ba ( T 1/2 =13 min) isotope produced at the ISOLDE facility at CERN. The PAC experiments were performed with an optimized γ–e − spectrometer coupled to the ISOLDE beam line, which allowed simultaneous implantation and measurement. The optimization of the experiment is described and the first results on metallic foils and single crystals of Al, Be, Ga, Zn, and Ni are presented and discussed. The derived nuclear moments of the 66.0 keV excited state of 127 Cs are | μ |=2.9(2) μ N and | Q |=0.58(12) b . Applications of this new PAC isotope are outlined.