Measurement of activation cross sections of aluminum for protons with energies between 0.4 GeV and 3.0 GeV at J-PARC

We measured activation cross sections of aluminum for 0.4, 1.3, 2.2, and 3.0 GeV protons at J-PARC to obtain basic data for nuclear design of beam windows as the test experiment. It was found that data with higher accuracy than current ones will be measured by using precise beam controls and highly accurate beam monitoring. We compared the experimental results, the evaluated data (JENDL-HE/2007), and calculation results with several intra-nuclear cascade models in PHITS. Although the experimental data agreed with JENDL-HE/2007, the calculations underestimated by about 40%, which could come from the evaporation model (GEM) included in PHITS code. It was found that the calculations with original GEM code show good agreement with the experimental data.