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Large-angle elastic scattering of α-particles from 20Ne and 22Ne
Authors:AA Cowley  JC Van Staden  SJ Mills  PM Cronje  G Heymann  GF Burdzik
Institution:National Physical Research Laboratory, Council for Scientific and Industrial Research, Pretoria, South Africa;National Accelerator Centre, Council for Scientific and Industrial Research, Stellenbosch, South Africa
Abstract:Resonances observed in the 177° (lab) excitation function of α-particles scattered elastically from 20Ne are investigated in terms of a single Regge pole. The position of the pole in the complex angular momentum plane is determined from angular distributions measured at incident α-particle energies of 25.8 and 27.0 MeV, at which energy values prominent maxima were observed in the excitation function and the pole contribution to these angular distributions is therefore expected to be a maximum. The complete trajectory of the pole over the energy region investigated (24.6 to 31.7 MeV) is obtained by means of extrapolation. The pole trajectory across the surface absorption region of the target nucleus clearly shows the reason for the occurrence of only three large resonances in this energy region, the remaining resonances being attenuated considerably. An angular distribution obtained for 22Ne(α, α)22Ne at an incident energy of 27.0 MeV also indicates the presence of the Regge pole found for 20Ne at the same energy, even though its strength is severely reduced due to the isotopic dependence effect.
Keywords:Nuclear reactions
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