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The relative positions, intensity and shape of narrow resonances (F ≈ 100 eV) in (p,γ), (p,αγ) and (p,p′γ) reactions induced on the isotopes 13C, 15N, 18O, 19F, 23Na, 24Mg, 27Al, 29Si, 30Si and 52Cr were investigated in the energy range from 150 to 2500 keV, using a fully atumatic hysteresis free energy scanning system. The energy differences between the resonance positions were measured with optimum accuracy, down to around ±100 eV. The results are of interest for the easy and accurate calibration of accelerators and for determining the energy scale in the neighbourhood of resonances used for depth profiling experiments with high precision. The new set-up allows the automatic recording of nuclear reaction or elastic scattering excitation curves over wide energy ranges, up to ±10% around any central energy. The results illustrate also how powerful a tool such a scanning system may be in various fields of ion beam analysis. |
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