Energy calibration of low energy proton beam with ¹⁸O(p, γ)¹⁹F and ²⁷Al(p, γ)²⁸Si resonant reactions

Low energy, high current proton accelerators, which can run stably for a long period, are crucial for low-energy nuclear astrophysical experiments．The HINEG(high intensity D-T fusion neutron generator) high-voltage platform at Hefei Institute of Physical Sciences, Chinese Academy of Sciences, can provide a proton beam up to 5 mA in the energy range of 70-260 keV．This high current accelerator was used to build a low-energy nuclear astrophysical platform．The beam energy was calibrated with ¹⁸O(p, γ)¹⁹F and ²⁷Al(p, γ)²⁸Si resonant reactions．Data were analyzed by Geant4 simulation．Simulations showed that for proton beams of 151.3 and 222.8 keV, energy spread was 0.97_-0.05^+0.02 and 1.39_-0.28^+0.12 keV, energy shift was (0.3±0.3) and (1.7±0.1) keV respectively．The HINEG platform satisfies requirements for nuclear astrophysics studies．