Abstract
The level structures of odd proton La139 and La141 have been studied in -ray singles, Compton-suppressed singles, coincidence, and angular correlation experiments. No evidence was observed to support the existence of any levels in La139 in the gap between the 166-keV d5/2 level and the 1209-keV (1/2)+ level, even though data were accumulated long enough to observe indirect feeding of the (1/2)+ level. Additional spin and parity assignments are suggested for a number of levels in La141 based on angular correlation measurements. © 1986 The American Physical Society.