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Measurement of nuclide production cross sections with 0.4 GeV - 3.0 GeV proton beams at J-PARC, 4-2; Cross sections of Ag and Ta

Matsuda, Hiroki ; Takeshita, Hayato*; Meigo, Shinichiro  ; Iwamoto, Hiroki  

For the improvement of nuclear design for Accelerator-Driven System (ADS), a production cross-section with higher accuracy is required. For data acquisition around 1 GeV energy range at J-PARC, protons in the energy region from 0.4 to 3.0 GeV were irradiated on Ag and Ta. Experiment and analysis methods were employed that were presented in the AESJ2018 autumn meeting. They were compared with the calculated data by PHITS code, and the one by the latest intranuclear cascade model INCL++ and a statistical decay model ABLA07. It was found that calculations for the $${}^{105}$$Ag, $${}^{79}$$Kr, and $${}^{7}$$Be production cross-sections with INCL-4.6/GEM, Bertini/GEM, and INCL-6.0/ABLA07 could predict the experimental data within a factor 0.5 to 2. On the other hand, in the case of $${}^{22}$$Na, $${}^{24}$$Na, and $${}^{101}$$Rh cross sections, all calculations showed huge overestimation or underestimation. In order to increase lighter nuclides such as Be and Na, we adopted a statistical multifragmentation model in the calculation. Although the calulcation was slightly improved still it has a large discrepancy in the experiment. Thus, a modification of the intra-nuclear cascade model was required, which is to be performed.

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