AMS measurements of the production cross sections of Cl-36 with protons up to 1 GeV

To investigate the cosmogenic production of Cl-36 from atmospheric argon, cross sections of the reactions Ar-40(p,alpha n)Cl-36 and Ar-40(p,2p3n)Cl-36 were measured using accelerator mass spectrometry. For this purpose, natural Ar-40 gas targets were 36 irradiated with protons in the energy interval 17-1000 MeV. The experimental data were compared with calculations according to the semi-empirical formalisms for spallation reactions of Rudstam and of Silberberg and Tsao. For energies below 40 MeV multi-step statistical model calculations were performed using the code STAPRE-H.