E0 transitions in the light tellurium isotopes: evidence for intruder states

Abstract

Conversion electron spectra have been measured for 118,120,122Te, following the beta decay of on-line mass-separated iodine isotopes. Several new Ipi =0+ states have been identified at low excitation energy. These, together with their E0 de-excitation strengths, provide evidence for the presence of intruder configurations, albeit mixed with the normal configurations. The experimental data are compared with IBM-2 mixing calculations.