In order to accurately model 41Ca production from solar cosmic ray (SCR) proton interactions on titanium at the lunar surface, we have measured the natTi(p,3pχn)41Ca excitation function for Ep = 35-150 MeV. The irradiated Ti foils were initially analyzed for their induced γ-activity to identify short-lived products and subsequently measured for their 41Ca content by accelerator mass spectrometry. Excitation curves, over the above energy range, were also obtained for 42,43K, 44g,44m,46,47,48Sc and 48V results for 41Ca are compared to both semi-empirical and model-based nuclear spallation calculations. We also used it to determine the magnitude and energy spectrum of the SCR flux from the measured Ca production profile in the Ti-rich lunar basalt, 74275. The results for K, Sc and V radionuclides were compared to previous measurements and agree favourably at low energies (E < 50 MeV) but are larger by ∼10-30% for higher energies.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics