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Journal Articles

Nuclide production cross section of $$^{nat}$$Lu target irradiated with 0.4-, 1.3-, 2.2-, and 3.0-GeV protons

Takeshita, Hayato; Meigo, Shinichiro; Matsuda, Hiroki; Iwamoto, Hiroki; Nakano, Keita; Watanabe, Yukinobu*; Maekawa, Fujio

JAEA-Conf 2021-001, p.207 - 212, 2022/03

Prediction of nuclide production of spallation products by high-energy proton injection plays a fundamental and important role in shielding design of high-intensity proton accelerator facilities such as accelerator driven nuclear transmutation system (ADS). Since the prediction accuracy of the nuclear reaction models used in the production quantity prediction simulation is insufficient, it is necessary to improve the nuclear reaction models. We have measured nuclide production cross sections for various target materials with the aim of acquiring experimental data and improving nuclear reaction models. In this study, 1.3-, 2.2- and 3.0-GeV proton beams were irradiated to $$^{nat}$$Lu target, and nuclide production cross-section data were acquired by the activation method. The measured data were compared with several nuclear reaction models used in Monte Carlo particle transport calculation codes to grasp the current prediction accuracy and to study how the nuclear reaction model could be improved.

Journal Articles

Measurement of nuclide production cross-sections of $$^{mathrm{nat}}$$Fe for 0.4-3.0 GeV protons in J-PARC

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

JPS Conference Proceedings (Internet), 33, p.011047_1 - 011047_6, 2021/03

Accurate nuclide production cross-section data are required for the design of Accelerator-Driven nuclear transmutation System (ADS) such as the design of radioactive waste disposal, design of remote-handling procedure of highly activated components, and evaluation of exposure doses of rad-workers. Although much efforts have been devoted to nuclide production cross-section measurements so far, uncertainties of the measured data are sometimes large as several tens percentage, and there is no experimental data in the GeV energy region even for some of important nuclides. In this study, proton induced nuclide production cross-section of iron, which is the most important constituent element of steel, was measured. The present experiment was compared with calculations by the PHITS code with several physics models including Bertini and INCL4.6 and evaluated nuclear data JENDL-HE/2007. The most significant discrepancy found in this study was the production cross sections via the (p,xn) reaction. It was suggested that further improvements, such as the in-medium effect on the nucleon-nucleon scattering and the Pauli blocking, were required in the intra-nuclear cascade models used in this study.

Journal Articles

Measurement of nuclide production cross section for lead and bismuth with proton in energy range from 0.4 GeV to 3.0 GeV

Matsuda, Hiroki; Meigo, Shinichiro; Iwamoto, Hiroki; Maekawa, Fujio

EPJ Web of Conferences, 239, p.06004_1 - 06004_4, 2020/09

 Times Cited Count:0 Percentile:73.14

For the Accelerator-Driven nuclear transmutation System (ADS), nuclide production yield estimation in the lead-bismuth target is important to manage the target. However, experimental data of nuclide production yield by spallation and high-energy fission reactions are scarce. In order to obtain the experimental data, we experimented in J-PARC using $$^{mathrm{nat}}$$Pb and $$^{mathrm{209}}$$Bi samples. The samples were irradiated with protons at various kinematic energy points between 0.4 and 3.0 GeV. After the irradiation, the nuclide production cross section over $$^{mathrm{7}}$$Be to $$^{mathrm{183}}$$Re was obtained by spectroscopic measurement of decay gamma-rays from the samples with HPGe detectors. The present experimental results were compared with the evaluated data (JENDL-HE/2007) and the calculation with the PHITS code and the INCL++ code. The present experiment data showed consistency with other experimental data with better accuracy than other ones. In reactions to produce light nuclides, JENDL and calculation with the PHITS and INCL++ for $$^{mathrm{7}}$$Be production agreed with the data.$$^{mathrm{22}}$$Na production, however, underestimated about 1/10 times. For middle to heavy nuclide productions cases, both calculations agreed with the experiment by a factor of two. JENDL showed lower energy having a maximum value of excitation function maximal value than the experimental data.

Oral presentation

Measurement of nuclide production cross sections with 0.4 GeV - 3.0 GeV proton beams at J-PARC

Matsuda, Hiroki; Meigo, Shinichiro; Iwamoto, Hiroki; Maekawa, Fujio

no journal, , 

For the improvement of nuclear design for Accelerator-Driven System (ADS), production cross section with higher accuracy is required. For data acquisition around 1 GeV energy range at J-PARC, protons having energy 0.8 and 3.0 GeV were irradiated on metal samples, which were sandwiched by several metal foils (0.1mm thickness). Analysis of the gold foils was started since there are many experimental data comparatively and is a monoisotopic element. Created activated nuclides were identified by germanium detectors. Finally, production cross sections were evaluated by irradiation parameters. They were compared with the evaluated data (JENDL-HE/2007) and the calculated one by PHITS code. It was found that the cross section of $$^{46}$$Sc agreed with JENDL-HE/2007 under 1.5 GeV region, it underestimated 50% above that region. The PHITS calculation underestimated drastically over whole energy range even though the GEM model which described an evaporation process were replaced by Furihata GEM model. For $$^{185}$$Os, namely spallation product, both the calculation and the evaluated data underestimated the data over the whole range. Thus, it was recommended that an intranuclear cascade model and an evaporation model implemented in PHITS should be modified.

Oral presentation

Measurement of nuclide production cross sections with 0.4 GeV - 3.0 GeV proton beams at J-PARC, 2; Cross sections of light nuclides

Matsuda, Hiroki; Meigo, Shinichiro; Iwamoto, Hiroki; Maekawa, Fujio

no journal, , 

For the improvement of nuclear design for Accelerator-Driven System (ADS), production cross section with higher accuracy is required. For data acquisition around 1 GeV energy range at J-PARC, protons having energy 0.4 to 3.0 GeV were irradiated on metal samples such as carbon and beryllium. Experiment and analysis methods were employed that were presented in the AESJ2018 autumn meeting. They were compared with the evaluated data (JENDL-HE/2007), the calculated one by PHITS code, and the one by the latest intranuclear cascade model INCL++ and a statistical decay model ABLA07. It was found that the cross section of $${}^{nat}C(p,x){}^{7}Be$$ and $${}^{9}Be(p,x){}^{7}Be$$ in this experiment has higher accuracy (approx. 7%) than other experiments due to precise beam control at J-PARC. JENDL/HE-2007 in which $${}^{nat}C(p,x){}^{7}Be$$ reaction is stored among light nuclides agreed with these results and other experiments within 9% uncertainty. PHITS calculation also showed a good agreement over the whole energy range. Especially PHITS in which the original GEM model was implemented, showed better agreement above 1 GeV range. Though the INCL++/ABLA07 calculations excellently agree with the experiments, the calculation overestimated over the whole range. In $${}^{9}Be(p,x){}^{7}Be$$ reaction, new experimental data were obtained around few GeV range. It was found that the calculation underestimated about 20 - 50% over the whole range.

Oral presentation

Measurement of nuclide production cross section with 0.4 GeV - 3.0 GeV proton beams at J-PARC, 3-2; Nuclide production cross section for Ni

Takeshita, Hayato; Meigo, Shinichiro; Matsuda, Hiroki; Iwamoto, Hiroki; Maekawa, Fujio

no journal, , 

For the purpose of improving nuclear design of high-energy and high-intensity proton accelerator facilities such as the accelerator-driven transmutation system (ADS), proton-induced nuclide production cross section was measured, and the results were compared with nuclear reaction models and evaluated nuclear data. We will report the nuclide production cross section for Ni which is used as the proton beam window material for ADS.

Oral presentation

Measurement of nuclide production cross section with 0.4 GeV - 3.0 GeV proton beams at J-PARC, 3-1; Cross sections of Zr and Ag

Matsuda, Hiroki; Takeshita, Hayato; Meigo, Shinichiro; Iwamoto, Hiroki; Maekawa, Fujio

no journal, , 

For the purpose of improving nuclear design of high-energy and high-intensity proton accelerator facilities such as the accelerator-driven transmutation system (ADS), proton-induced nuclide production cross section was measured, and the results were compared with nuclear reaction models and evaluated nuclear data. We will report the nuclide production cross section for Zr and Ag.

Oral presentation

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

no journal, , 

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.

Oral presentation

Nuclide production cross sections of Mn and Co by GeV protons

Takeshita, Hayato; Meigo, Shinichiro; Matsuda, Hiroki; Iwamoto, Hiroki; Nakano, Keita; Watanabe, Yukinobu*; Maekawa, Fujio

no journal, , 

Prediction of nuclide production of spallation products by high-energy proton injection plays a fundamental and important role in shielding design of high-intensity proton accelerator facilities such as accelerator driven nuclear transmutation system (ADS). Since the prediction accuracy of the nuclear reaction models used in the production quantity prediction simulation is insufficient, it is necessary to improve the nuclear reaction models. We have measured nuclide production cross sections for various target materials with the aim of acquiring experimental data and improving nuclear reaction models. In this study, 1.3-, 2.2- and 3.0-GeV proton beams were irradiated to two medium-heavy targets, i.e., Mn and Co, and nuclide production cross-section data were acquired by the activation method. The measured data were compared with several nuclear reaction models used in Monte Carlo particle transport calculation codes (INCL-4.6/GEM, Bertini/GEM, JAM/GEM, INCL++/ABLA07) and the high energy nuclear data library JENDL/HE-2007 to grasp the current prediction accuracy and to study how the nuclear reaction model could be improved.

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