The elastic scattering of 25MeV α-particles and neutron shell effects in the A = 50 TO A = 93 mass region

High precisionY89(α,α)Kiss1, Mohr2, Fülöp3 et al. 2009Phys. Rev. C

“…Although an uncertainty of about ±15% is claimed in Ref. [12], the comparison to the data by England et al [13] shows that the data by Wit et al [12][13][14][15][16]. The parameters of the fits are listed in Table I. from slightly above the Coulomb barrier up to 160 MeV.…”

“…The data by England et al [13] cover the whole angular range from forward to backward directions. As expected, at forward angles the data agree with the Rutherford cross section, and thus the uncertainty of the absolute normalization of the data is of the order of a few percentages.…”

“…[12] in the energy range of 18 MeV E α,lab 26 MeV, i.e., covering the energy range of the angular distributions in this work and in Refs. [12,13]. This excitation function has been calculated using the potential from the fit to the 20.1-MeV data from Ref.…”

“…At these energies a reliable test for the global parametrization is possible using the new high-precision data. Furthermore, we can use data from the literature [12,13] to investigate the variation of the imaginary part of the optical potential between E c.m. ≈ 15.5 and 23.9 MeV in small steps of approximately 2 MeV.…”

“…The measured angular distributions as well as the ratio of the elastic-scattering cross sections of the two N = 50 nuclei 89 Y and 92 Mo are compared to predictions using several global optical potential parametrizations in Sec. IV; additionally, calculations are compared to angular distributions at higher energies and to excitation functions from literature [12,13]. Finally, conclusions are drawn in Sec.…”