In-beam-γ-ray spectroscopy of excited states in odd-mass N = 80 nuclei

The level structure of N = 80 nuclei, 143Eu, 141Pm, and 139Pr have been studied using the techniques of in-beam γ-ray spectroscopy. The data were obtained by measuring γ-ray singles spectra, excitation functions (in 143Eu case), prompt and delayed γ-γ coincidences, and angular distributions of the γ-rays, following the (p,2nγ) and (α,4nγ) reactions. In all of these experiments, high resolution Ge(Li) detectors were used. For most of the levels in these nuclei, spin and parity values could unambiguously be attributed on the basis of the angular distribution data from this work and inputs from previous β-decay data