Abstract
Yrast states in 217Fr have been populated by bombardment of a 210Pb radioactive target with 11B ions at energies in the range 52-68 MeV. Measurements of gamma -ray excitation functions, gamma -ray angular distributions and gamma - gamma coincidences were made. The proposed level spectrum exhibits at medium angular momenta alternating positive and negative parity levels strongly coupled by E1 transitions. A survey of the neighbouring nuclei leads to the conclusion that in the actinide region 217Fr and 217Ra are the lightest nuclei presenting properties which are generally related to static intrinsic reflection asymmetric shapes.
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