Novel measurements of (α,γ) and (α,n) reaction cross
sections on the target nucleus 151Eu, close to the reaction thresholds,
support the setting up of recent parameters of the α-particle optical
model potential below the Coulomb barrier. A better understanding of the
α-particle optical potential at these energies leads to a statistical
model analysis of additional partial cross sections that were formerly measured
but not considered within the model analysis. On this basis we have tentatively
assigned a modified Jπ=9− spin and parity to the 22.7-h isomer in
154Tb.Comment: 3 pages, 2 figure