Voltage Calibration of Low-Energy Accelerators*

The12C(p, γ)13N reaction has been used as a method to determine the absolute proton beam energy in the region ofE p =150–350 keV with a precision of the order of 0.4 keV. The method makes use of the resulting captureγ-ray transition, whose intensity varies smoothly with beam energy and whose varying energy can be determined to high accuracy by comparison with precisely known energies ofγ-rays from radioactive sources.