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Journal Articles

Measurement of nuclide production cross sections for proton-induced reactions on Mn and Co at 1.3, 2.2, and 3.0 GeV

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

Nuclear Instruments and Methods in Physics Research B, 511, p.30 - 41, 2022/01

Nuclide production cross sections for proton-induced reactions on Mn and Co at incident energies of 1.3, 2.2, and 3.0 GeV were measured by the activation method at the J-PARC. In total, 143 production cross sections of reaction products were obtained. Among them, the cross sections of $$^{55}$$Mn(p,X)$$^{38}$$S and $$^{55}$$Mn(p,X)$$^{41}$$Ar were measured for the first time. The stable proton beam and well established beam monitoring system contributed to the reduction of the systematic uncertainties to typically less than 5%, which was better than those of the previous data. To examine the prediction capabilities of spallation reaction models and evaluated data library, the measured data were compared with the spallation reaction models in PHITS (INCL4.6/GEM, etc.), INCL++/ABLA07, and the JENDL/HE-2007 library. The comparison of the mean square deviation factors indicated that both INCL4.6/GEM and JENDL/HE-2007 showed better agreement with the measured data than the others.

Journal Articles

Nuclide production cross sections of Ni and Zr irradiated with 0.4-, 1.3-, 2.2-, and 3.0-GeV protons

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

JPS Conference Proceedings (Internet), 33, p.011045_1 - 011045_6, 2021/03

To improve accuracy of nuclear design of accelerator driven nuclear transmutation systems, nuclide production cross sections on Ni and Zr, which were candidate materials to be used in ADS, were measured for GeV energy protons. The measured results were compared with PHITS calculations and JENDL/HE-2007.

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 thick target neutron yield at 180$$^{circ}$$ for a mercury target induced by 3-GeV protons

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

Nuclear Instruments and Methods in Physics Research B, 483, p.33 - 40, 2020/11

 Times Cited Count:0 Percentile:0.02(Instruments & Instrumentation)

A thick target neutron yield for a mercury target at an angle of 180$$^{circ}$$ from the incident beam direction is measured with the time-of-flight method using a 3-GeV proton beam at the Japan Proton Accelerator Research Complex (J-PARC). Comparing the experimental result with a Monte Carlo particle transport simulation by the Particle and Heavy Ion Transport code System (PHITS) shows that there are apparent discrepancies. We find that this trend is consistent with an experimental result of neutron-induced re- action rates obtained using indium and niobium activation foils. Comparing proton-induced neutron-production double-differential cross-sections for a lead target at backward directions between the PHITS calculation and experimental data suggests that the dis- crepancies for our experiments would be linked to the neutron production calculation around 3 GeV by the PHITS spallation model and/or the calculation of nonelastic cross-sections around 3 GeV in the particle transport simulation.

Oral presentation

Measurement of the energy spectrum of spallation neutron emitted to the most backward angle of 180$$^circ$$ produced from thick mercury target irradiated with 3 GeV protons

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

no journal, , 

Even though the neutron spectrum produced to most backward along the proton beam direction is essential for the shield design for Accelerator-Driven System (ADS) and high-intensity spallation neutron source, the experimental data are scarce. For the validation of source term of radiation, we have measured the energy spectrum of the neutron emitted to the most backward angle of 180$$^circ$$ produced from mercury target irradiated with 3 GeV proton at the Material Life Science Experimental Facility (MLF) in J-PARC. In the experiment, the spectrum was measured by time-of-flight (TOF) method with the liquid scintillator (NE213) placed at the upstream of the bending magnet with flight-path of 126 m to the mercury target in order to obtain high energy resolution. In order to obtain low energy neutron around at 1 MeV, a small scintillator was employed. The neutron detection efficiency was calculated with the SCINFUL-R code with the correction of experimental result with $$^{252}$$Cf source in low energy region less than 10 MeV. It was found that the PHITS calculation with INCL4.6 and GEM is in good agreement with the experiment in the energy reason less than 20 MeV.

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

Generation of nuclide-production cross-section data using Gaussian process regression

Iwamoto, Hiroki; Takeshita, Hayato*

no journal, , 

no abstracts in English

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.

Oral presentation

Measurement of nuclide production cross section of Bismuth by GeV proton irradiation

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

no journal, , 

Accelerator-driven nuclear transmutation system (ADS) is one of the promising options to solve the nuclear issue of the high-level radioactive waste disposal. Nuclide production cross sections of Pb and Bi, which play an important role as a spallation target and coolant, are necessary to evaluate the residual activity and to investigate the behavior of impurities. In this presentation, measured nuclide production cross sections of Bismuth by GeV proton irradiation will be presented together with theoretical calculations.

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