Phys. Rev. C 80, 045807 (2009) [15 pages]High precision 89Y(α,α)89Y scattering at low energiesReceived 18 August 2009; published 23 October 2009 Elastic scattering cross sections of the 89Y(α,α)89Y reaction have been measured at energies Ec.m.=15.51 and 18.63 MeV. The high-precision data for the semimagic N=50 nucleus 89Y are used to derive a local potential and to evaluate the predictions of global and regional α-nucleus potentials. The variation of the elastic α-scattering cross sections along the N=50 isotonic chain is investigated by a study of the ratios of angular distributions for 89Y(α,α)89Y and 92Mo(α,α)92Mo at Ec.m.≈15.51 and 18.63 MeV. This ratio is a very sensitive probe at energies close to the Coulomb barrier, where scattering data alone is usually not enough to characterize the different potentials. Furthermore, α-cluster states in 93Nb=89Y⊗α are investigated. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.80.045807
DOI:
10.1103/PhysRevC.80.045807
PACS:
24.10.Ht, 25.55.Ci, 26.30.-k
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