Accelerator beam energy calibration with the Al(p, n) and Al(p, γ) reactions

The energies of resonances in the ²⁷Al(p, γ) reaction at 992 and 1317 keV and of the threshold of the ²⁷Al(p, n) reaction at 5804 keV have been measured accurately with respect to a 1 V standard. Both calibration energies and energies suitable for Q-value calculations are given. Corrections are made for the effects of the energy distribution of the proton beam, of nonuniform energy loss of the protons in the target and of ionisation of the target atoms.