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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.

Journal Articles

Experimental evaluation of wall shear stress in a double contraction nozzle using a water mock-up of a liquid Li target for an intense fusion neutron source

Kondo, Hiroo*; Kanemura, Takuji*; Park, C. H.*; Oyaizu, Makoto*; Hirakawa, Yasushi; Furukawa, Tomohiro

Fusion Engineering and Design, 146(Part A), p.285 - 288, 2019/09

 Times Cited Count:1 Percentile:17.7(Nuclear Science & Technology)

Herein, the wall shear stress in a double contraction nozzle has been evaluated experimentally to produce a liquid lithium (Li) target as a beam target for intense fusion neutron sources such as the International Fusion Materials Irradiation Facility (IFMIF), the Advanced Fusion Neutron Source (A-FNS), and the DEMO Oriented Neutron Source (DONES). The boundary layer thickness and wall shear stress are essential physical parameters to understand erosion-corrosion by the high-speed liquid Li flow in the nozzle, which is the key component in producing a stable Li target. Therefore, these parameters were experimentally evaluated using an acrylic mock-up of the target assembly. The velocity distribution in the nozzle was measured by a laser-doppler velocimeter and the momentum thickness along the nozzle wall was calculated using an empirical prediction method. The resulting momentum thickness was used to estimate the variation of the wall shear stress along the nozzle wall. Consequently, the wall shear stress was at the maximum in the second convergent section in front of the nozzle exit.

Journal Articles

Thick target neutron yields from 100- and 230-MeV/nucleon helium ions bombarding water, PMMA, and iron

Tsai, P.-E.; Heilbronn, L. H.*; Lai, B.-L.*; Iwata, Yoshiyuki*; Murakami, Takeshi*; Sheu, R.-J.*

Nuclear Instruments and Methods in Physics Research B, 449, p.62 - 70, 2019/06

 Times Cited Count:1 Percentile:17.7(Instruments & Instrumentation)

The secondary neutrons produced from 100- and 230-MeV/nucleon He ions, respectively, stopping in the thick iron, PMMA and water targets are measured by the time of flight method combined with the pulse shape discrimination of liquid scintillators. The experimental data show that the secondary neutrons were contributed from breakup of projectiles, emission from overlap regions of projectile nuclei and target nuclei, and evaporation of projectiles and target nuclei. The measured double-differential thick target neutron yields, angular distributions, and total neutron yields per ion, were benchmarked by the PHITS, FLUKA, and MCNP model calculations. The default models in these codes agree the experimental data well at intermediate-to-large angles in the low-to-intermediate energy range. However, the physics models implemented in PHITS need further improvement for some particular nuclear interaction mechanisms, and this work can be an importance reference for future model development.

Journal Articles

Impact of PHITS spallation models on the neutronics design of an accelerator-driven system

Iwamoto, Hiroki; Nishihara, Kenji; Iwamoto, Yosuke; Hashimoto, Shintaro; Matsuda, Norihiro; Sato, Tatsuhiko; Harada, Masahide; Maekawa, Fujio

Journal of Nuclear Science and Technology, 53(10), p.1585 - 1594, 2016/10

 Times Cited Count:13 Percentile:83.03(Nuclear Science & Technology)

Journal Articles

Measurement of neutron spectra produced in the forward direction from thick graphite, Al, Fe and Pb targets bombarded by 350 MeV protons

Iwamoto, Yosuke; Taniguchi, Shingo*; Nakao, Noriaki*; Itoga, Toshio*; Nakamura, Takashi*; Nakane, Yoshihiro; Nakashima, Hiroshi; Satoh, Daiki; Yashima, Hiroshi*; Yamakawa, Hiroshi*; et al.

Nuclear Instruments and Methods in Physics Research A, 562(2), p.789 - 792, 2006/06

 Times Cited Count:6 Percentile:44.98(Instruments & Instrumentation)

Neutron energy spectra produced from thick targets play an important role in validation of calculation codes that are employed in the design of spallation neutron sources and the shielding design of accelerator facilities. However, appropriate experimental data were scarce in the forward direction for the incident energy higher than 100 MeV. In this study, neutron spectra at 0 degree from thick targets bombarded with 350 MeV protons were measured by the time-of-flight technique using an NE213. The targets used were graphite, Al, Fe and Pb and their thicknesses were chosen to be a little thicker than the stopping lengths. The experiment was carried out at the TOF course of the RCNP (Research Center of Nuclear Physics) ring cyclotron, Osaka University. The flight path length between center of the target and of an NE213 were 11.4 m for the measurement of low energy neutrons and 95 m for high energy neutrons. The experimental data are compared with the calculated results by using the Monte Carlo transport codes, such as MCNPX and PHITS codes.

Journal Articles

Measurements of neutron spectra produced from a thick iron target bombarded with 1.5-GeV protons

Meigo, Shinichiro; Shigyo, Nobuhiro*; Iga, Kiminori*; Iwamoto, Yosuke*; Kitsuki, Hirohiko*; Ishibashi, Kenji*; Maehata, Keisuke*; Arima, Hidehiko*; Nakamoto, Tatsushi*; Numajiri, Masaharu*

AIP Conference Proceedings 769, p.1513 - 1516, 2005/05

For validation of calculation codes that are employed in the design of accelerator facilities, spectra of neutrons produced from a thick iron target bombarded with 1.5-GeV protons were measured. The calculated results with NMTC/JAM were compared with the present experimental results. It is found the NMTC/JAM generally shows in good agreement with experiment. Furthermore, the calculation gives good agreement with the experiment for the energy region 20 to 80 MeV, whereas the NMTC/JAM gives 50 % of the experimental data for the heavy nuclide target such as lead and tungsten target.

Journal Articles

Thick target benchmark test for the code used in the design of high intensity proton accelerator project

Meigo, Shinichiro; Harada, Masahide; Takada, Hiroshi

Proceedings of ICANS-XVI, Volume 3, p.1059 - 1067, 2003/07

In the neutronics design for the J-PARC facilities, transport codes of NMTC/JAM, MCNPX and MARS are used. In order to confirm the predict ability for these codes, it is important to compare with the experiment result. For the validation of the source term of neutron, the calculations are compared with the experimental spectrum of neutrons produced from thick target. Although slightly disagreement exists, NMTC/JAM, MCNPX and MARS are in good agreement with the experiment within by a factor of 2.

Journal Articles

Shielding experiments and analyses on proton accelerator facility at TIARA

Nakashima, Hiroshi; Sakamoto, Yukio*; Tanaka, Shunichi; Tanaka, Susumu; Baba, Mamoru*; Nakamura, Takashi*; Hirayama, Hideo*; Shin, Kazuo*; JAERI-Universities Collaboration Working Group for Accelerator Shielding Study

Proceedings of 6th International Meeting on Nuclear Applications of Accelerator Technology (AccApp '03), p.959 - 968, 2003/00

In order to validate shielding design methods on proton accelerator facilities, a series of shielding experiments in several tens of MeV energy region were carried out at the Takasaki Ion Accelerators for Advanced Radiation Application (TIARA) of Japan Atomic Energy Research Institute (JAERI). The experiments include thick target neutron yield (TTY) measurements by charged particles, deep penetration experiments on concrete, steel and polyethylene shields using p-Li monoenergetic neutron source and radiation streaming experiment at a labyrinth of TIARA using p-Cu white neutron source. These experimental results are compared with calculation results with some high-energy particle transport codes such as MCNPX and NMTC/JAERI. The TTY measurements were analyzed by a code developed by Shin with a moving source model, and the streaming experiment was also analyzed by the DUCT-III code based on Shin's equation. This paper reviews the experimental results and the analyses on the results.

Journal Articles

Photofission of $$^{209}$$Bi at intermediate energies

Haba, Hiromitsu; Kasaoka, Makoto*; Igarashi, Manabu*; Washiyama, Koshin*; Matsumura, Hiroshi*; Oura, Yasuji*; Shibata, Seiichi*; Sakamoto, Ko*; Furukawa, Michiaki*; Fujiwara, Ichiro*

Radiochimica Acta, 90(7), p.371 - 382, 2002/08

 Times Cited Count:2 Percentile:17.46(Chemistry, Inorganic & Nuclear)

The reaction yields of 63 radionuclides with the mass number A = 56-135 produced in the photofission of $$^{209}$$Bi by bremsstrahlung of end-point energies (E$$_{0}$$) from 450 to 1100 MeV have been measured using a catcher foil technique. The charge distribution was well reproduced by a Gaussian function with the most probable charge (Z$$_{p}$$) expressed by Z$$_{p}$$ = RA + S, and with the A-independent FWHME$$_{CD}$$. The charge distribution parameters R, S and FWHM$$_{CD}$$ were independent of E$$_{0}$$ above 600 MeV. The weighted mean values at E$$_{0}$$ $$geq$$ 600 MeV were R = 0.421 $$pm$$ 0.001, S = 0.6 $$pm$$ 0.1 and FWHM$$_{CD}$$ = 2.1 $$pm$$ 0.1 charge unit (c.u.). Based on the charge distribution parameters, the symmetric mass yield distributions with the most probable mass A$$_{p}$$ of 96 $$pm$$ 1 mass unit (m.u.) and the width FWHM$$_{MD}$$ of 33 $$pm$$ 1 m.u. were also obtained. The characteristics of the charge and mass yield distributions are discussed by referring to those for $$^{197}$$Au based on the results of calculations using PICA3/GEM.

Journal Articles

Analysis of neutron spectra from thick targets bombarded with 710-MeV $$alpha$$ particles by quantum molecular dynamics plus statistical decay model

Meigo, Shinichiro; Chiba, Satoshi; Shin, Kazuo*

Journal of Nuclear Science and Technology, 36(3), p.250 - 255, 1999/03

 Times Cited Count:1 Percentile:13.47(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Comments on the cross sections of $$^{186}$$Re in the $$^{186}$$W(p,n) and $$^{186}$$W(d,2n) reactions in connection to the paper given by Z.H.Zhu et at. and correction of the calculated yields of $$^{186}$$Re in the $$^{186}$$W(p,n) reaction

Ishioka, Noriko; Sekine, Toshiaki; R.M.Lambrecht*

Journal of Radioanalytical and Nuclear Chemistry, 241(2), 383 Pages, 1999/00

 Times Cited Count:4 Percentile:59.59(Chemistry, Analytical)

no abstracts in English

Journal Articles

Measurements of neutron spectra produced from a thick lead target bombarded with 0.5- and 1.5-GeV protons

Meigo, Shinichiro; Takada, Hiroshi; Chiba, Satoshi; *; *; *; Maehata, Keisuke*; Shigyo, Nobuhiro*; Watanabe, Yukinobu*; Numajiri, M.*

Nuclear Instruments and Methods in Physics Research A, 431(3), p.521 - 530, 1999/00

 Times Cited Count:36 Percentile:91.32(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Water experiment of high-speed, free-surface, plane jet along concave wall

Nakamura, Hideo; *; Kukita, Yutaka*; *; ; Maekawa, Hiroshi

Eighth Int. Topical Meeting on Nuclear Reactor Thermal-Hydraulics (NURETH-8), 3, p.1268 - 1275, 1997/00

no abstracts in English

Journal Articles

Neutron yields from actinoide oxides

; ; ;

Appl.Radiat.Isot., 37(2), p.121 - 125, 1986/00

no abstracts in English

JAEA Reports

Neutron Yields from Bombardment of $$alpha$$-Particles


JAERI-M 82-117, 66 Pages, 1982/09


no abstracts in English

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.

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