NE-20 STATES OBSERVED VIA O-16(ALPHA,ALPHA1)O-16

Surface barrier detectors at 16-18 angles measured simultaneously the differential cross sections for the reactions O16(α,α0α1α2α3α4α5)O16 in the bombarding energy range from 14.6 to 20.4 MeV and in steps of 10 keV. For Eα>18 MeV peak fitting techniques separated the yields of α1 (Q=-6.05 MeV) from α2 (Q=-6.13 MeV). The target was a differentially pumped windowless gas target of high purity O2. A total of 25 levels in Ne20 (16Ex21 MeV) were analyzed by writing the reaction amplitude for spinless positive-parity particles as a nonresonant term which varies linearly with energy plus a sum over only resonant partial waves. Inelastic scattering angular distributions were expanded in terms of Legendre polynomials for Eα>18 MeV. NUCLEAR REACTIONS O16(α,α0α1α2α3α4α5)O16, 14.6Eα20.4 MeV, ΔEα=10 keV; measured σ(E,θ) at 18 angles. Deduced Ne20 level parameters J, π, Γα0, Γα1, Γ, ER. O2 gas target. © 1979 The American Physical Society.