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Journal Articles

Evaluation of the performance of event reconstruction algorithms in the JSNS$$^2$$ experiment using a $$^{252}$$Cf calibration source

Lee, D. H.*; Dodo, Taku; Haga, Katsuhiro; Harada, Masahide; Hasegawa, Shoichi; Kasugai, Yoshimi; Kinoshita, Hidetaka; Masuda, Shiho; Meigo, Shinichiro; Sakai, Kenji; et al.

Nuclear Instruments and Methods in Physics Research A, 1072, p.170216_1 - 170216_6, 2025/03

 Times Cited Count:2 Percentile:98.29(Instruments & Instrumentation)

Journal Articles

Pulse shape discrimination in JSNS$$^2$$

Dodo, Taku; Haga, Katsuhiro; Harada, Masahide; Hasegawa, Shoichi; Kasugai, Yoshimi; Kinoshita, Hidetaka; Masuda, Shiho; Meigo, Shinichiro; Sakai, Kenji; Suzuya, Kentaro; et al.

Progress of Theoretical and Experimental Physics (Internet), 2025(2), p.023H02_1 - 023H02_8, 2025/02

 Times Cited Count:0 Percentile:0.00(Physics, Multidisciplinary)

Journal Articles

First measurement of missing energy due to nuclear effects in monoenergetic neutrino charged-current interactions

Marzec, E.*; Dodo, Taku; Haga, Katsuhiro; Harada, Masahide; Hasegawa, Shoichi; Kasugai, Yoshimi; Kinoshita, Hidetaka; Masuda, Shiho; Meigo, Shinichiro; Sakai, Kenji; et al.

Physical Review Letters, 134, p.081801_1 - 081801_9, 2025/00

 Times Cited Count:1 Percentile:0.00(Physics, Multidisciplinary)

Journal Articles

$$alpha$$-induced total reaction cross sections based on the intranuclear cascade model

Nakano, Masahiro*; Yamaguchi, Yuji; Furuta, Toshimasa*; Uozumi, Yusuke*

Physical Review C, 110(6), p.064620_1 - 064620_5, 2024/12

 Times Cited Count:0 Percentile:0.00(Physics, Nuclear)

Alpha-induced total reaction cross sections in the low-energy region below 400 MeV are investigated using an intranuclear cascade model based on the extended framework for nucleon- and deuteron-induced reactions. Experimental data for $$^{12}$$C, $$^{28}$$Si, $$^{40}$$Ca, and $$^{208}$$Pb targets are reproduced well by calculations performed with reasonable parameters close to those determined in other studies. It is shown that two effects, namely, discrete level constraint (DLC) and the Coulomb effect, provide important contributions that depend on the incident- energy and target. The DLC effect is limited to a narrow region of low-energy and is very important in light targets. The Coulomb effect is decisive on cross sections in $$^{208}$$Pb, while the DLC contribution for the heavy target is small. It is concluded that this trend in the contribution of both effects is consistent with proton- and deuteron-induced total reaction cross sections.

Journal Articles

Effect of carbon segregation at prior austenite grain boundary on hydrogen-related crack propagation behavior in 3Mn-0.2C martensitic steels

Okada, Kazuho*; Shibata, Akinobu*; Kimura, Yuji*; Yamaguchi, Masatake; Ebihara, Kenichi; Tsuji, Nobuhiro*

Acta Materialia, 280, p.120288_1 - 120288_14, 2024/11

 Times Cited Count:2 Percentile:36.18(Materials Science, Multidisciplinary)

Journal Articles

SiC sensor wire test by heavy ion beam irradiation, 2

Meigo, Shinichiro; Yamaguchi, Yuji

Proceedings of 21st Annual Meeting of Particle Accelerator Society of Japan (Internet), p.853 - 858, 2024/10

no abstracts in English

Journal Articles

Investigation of solenoid fringe field based on change in 3-Gev proton beam orbit and the orbit correction

Yamaguchi, Yuji; Meigo, Shinichiro; Yamazaki, Takayuki*

Proceedings of 21st Annual Meeting of Particle Accelerator Society of Japan (Internet), p.239 - 243, 2024/10

Fringe field of a secondary-particle capture solenoid magnet with three coils has been experimentally investigated placed at muon science facility in materials and life science experimental facility (MLF), J-PARC. To clarify relationship between the fringe field and excitation current of each coil and interference of fields by the coils, proton beam position changes in vertical direction were measured for 125(= 5$$^{3}$$) combinations of excitation currents using a multi-wire profile monitor located in front of the final target of MLF. The measured position changes show that the field by the most upstream coil is non-linear with its current while the fields by other coils are linear and that the field can be enhanced by excitation of multiple coils. The non-linearity of the filed by the most upstream coil has been introduced to the proton beam orbit correction, which has been demonstrated.

Journal Articles

Proton beam utilization for space development equipment at J-PARC

Meigo, Shinichiro; Yamaguchi, Yuji; Iwamoto, Hiroki

Proceedings of 21st Annual Meeting of Particle Accelerator Society of Japan (Internet), p.32 - 37, 2024/10

no abstracts in English

JAEA Reports

Dataset of nuclide production from nuclear capture reaction of negative muon based on Monte Carlo simulation

Yamaguchi, Yuji; Harada, Masahide; Haga, Katsuhiro

JAEA-Data/Code 2024-008, 91 Pages, 2024/08

JAEA-Data-Code-2024-008.pdf:1.24MB
JAEA-Data-Code-2024-008-appendix(CD-ROM).zip:0.09MB

We have produced a dataset of the yields of radionuclides produced by the nuclear capture of negative muons applying Monte Carlo calculation due to scarce experimental data for the sake of radiation safety of experimental facilities which can provide negative muons. The dataset covers all the stable targets of natural elements. The use of the dataset is described in an example of radioactive estimation for a negative-muon-irradiated sample. The dataset reported is fundamental data expected to be utilized in experiments with negative muons of various fields including radiation safety.

Journal Articles

Study on the accidental background of the JSNS$$^2$$ experiment

Lee, D. H.*; Dodo, Taku; Haga, Katsuhiro; Harada, Masahide; Hasegawa, Shoichi; Kasugai, Yoshimi; Kinoshita, Hidetaka; Masuda, Shiho; Meigo, Shinichiro; Sakai, Kenji; et al.

European Physical Journal C, 84, p.409_1 - 409_6, 2024/04

 Times Cited Count:1 Percentile:35.96(Physics, Particles & Fields)

JAEA Reports

Model catchments for testing biosphere assessment models of geological disposal

Yamaguchi, Masaaki; Suzuki, Yuji*; Kabasawa, Satsuki; Kato, Tomoko

JAEA-Data/Code 2024-001, 21 Pages, 2024/03

JAEA-Data-Code-2024-001.pdf:3.45MB
JAEA-Data-Code-2024-001-appendix(CD-ROM).zip:8.0MB

Model catchments have developed for use in testing various assessment models that can consider specific surface environmental conditions such as topography, riverine systems, and land use in the biosphere assessment of HLW geological disposal. The model catchments consist of the topography and riverine system of the catchment area created using existing tools, as well as land use and population distribution, river discharge, sediment flux data set by algorithms from topographical data. Datasets of three types of model watersheds (Types 1 to 3, watershed area: 730 to 770 km$$^{2}$$) with different topographical characteristics have released as raster data that can be handled by geographic information systems (GIS). Since the model catchments were created virtually reflecting as much as possible the main characteristics of Japan's surface environment, they can be used as a test bed for conducting hydraulic/mass transport analysis to set the GBI and compartment model.

Journal Articles

Double-differential cross sections for charged particle emissions from $$alpha$$ particle impinging on Al at 230 MeV/u

Furuta, Toshimasa*; Uozumi, Yusuke*; Yamaguchi, Yuji; Iwamoto, Yosuke; Koba, Yusuke*; Velicheva, E.*; Kalinnikov, V.*; Tsamalaidze, Z.*; Evtoukhovitch, P.*

Journal of Nuclear Science and Technology, 61(2), p.230 - 236, 2024/02

 Times Cited Count:0 Percentile:0.00(Nuclear Science & Technology)

Charged particle production from $$alpha$$ particle fragmentation reactions was investigated experimentally by measurement of 230-MeV/u $$alpha$$ particles bombarding an aluminum target. Double differential cross sections were measured for each ejectile of p, d, t, $$^{3}$$He, and $$^{4}$$He at laboratory angles between 15 and 60 deg. The results of analyzed data found the following common characteristics: (1) spectra of proton- and neutron-emission are similar in high energy region at forward angle, (2) triton-to-$$^{3}$$He ratio of $$alpha$$-breakup yield is 1:2, which is similar to lower incident energy experiment, and (3) the shape of broad peak formed by $$^{3}$$He and $$alpha$$ particles could be explained by the process with collision between induced $$alpha$$ particle and target nucleus.

Journal Articles

The Acrylic vessel for JSNS$$^2$$-II neutrino target

Shin, C. D.*; Dodo, Taku; Haga, Katsuhiro; Harada, Masahide; Hasegawa, Shoichi; Kasugai, Yoshimi; Kinoshita, Hidetaka; Masuda, Shiho; Meigo, Shinichiro; Sakai, Kenji; et al.

Journal of Instrumentation (Internet), 18(12), p.T12001_1 - T12001_9, 2023/12

 Times Cited Count:0 Percentile:0.00(Instruments & Instrumentation)

Journal Articles

Development of secondary GeV protons utilization using scattering at beam window

Meigo, Shinichiro; Yamaguchi, Yuji; Nakano, Keita*; Sugihara, Kenta*

Proceedings of 19th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.132 - 136, 2023/01

J-PARC accelerator facility is the only accelerator facility in Japan that can provide proton beams in the energy range of 400 MeV or higher. In the J-PARC accelerator facility, it is difficult to install users' experimental equipment inside the proton beam duct in order to maintain stable user operation. In addition, due to the characteristics of the synchrotron accelerator, it is not possible to supply a low-intensity beam enough to confirm the detector. In addition, it is important to improve the intranuclear cascade model (INCL) for high-intensity proton accelerator facilities such as accelerator-driven transmutation systems (ADS), etc. In order to improve the INCL, DDX of the forward-most emitted particles is important, but new data should be obtained since there are few experimental data available. In order to promote space utilization and to improve the accuracy of the INCL, energy spectra of scattered protons at the Al beam window placed at the inlet of the 3NBT dump were measured. In the experiment, plastic scintillators were used with 400 MeV proton beam. The results show that the spectra have sharp peaks due to elastic scattering. The calculation of the PHITS code using INCL reproduced the sharp peak due to elastic scattering well, although it overestimated the contribution of quasi-elastic scattering in the experimental data. In conclusion, it is clear that the present method can be used to utilize protons in several GeV regions for space exploration.

JAEA Reports

Proceedings of the 2021 Symposium on Nuclear Data; November 18-19, 2021, On-line Connection Conference

Yamaguchi, Yuji; Meigo, Shinichiro

JAEA-Conf 2022-001, 226 Pages, 2022/11

JAEA-Conf-2022-001.pdf:17.97MB

The 2021 Symposium on Nuclear Data was held as an online connection conference on November 18-19, 2021. The symposium was organized by the Nuclear Data Division of the Atomic Energy Society of Japan (AESJ) in cooperation with the Sigma Investigative Advisory Committee of AESJ, J-PARC Center, Nuclear Science and Engineering Center of Japan Atomic Energy Agency (JAEA), and High Energy Accelerator Research Organization (KEK). In the symposium, tutorials "New Developments in TALYS and TENDL-2021" and "Role of ADS and its Development Issues" were proposed and held. Three sessions of lectures and discussions were held: "J-PARC and JAEA Facilities", "Current Status and Future Prospects of Nuclear Data Research", and "Medical, Isotope Production, and Analysis". In addition, recent research progress on experiments, nuclear theory, evaluation, benchmark, and applications were presented in the poster session. The total number of participants was 132 participants. Each oral and poster presentation was followed by an active question and answer session. This report consists of a total of 36 papers including 14 oral and 22 poster presentations.

Journal Articles

Deuteron-induced nonelastic cross sections based on the intranuclear cascade model with independent incident particles under interaction potentials

Nakano, Masahiro*; Yamaguchi, Yuji; Uozumi, Yusuke*

Physical Review C, 106(1), p.014612_1 - 014612_8, 2022/07

 Times Cited Count:1 Percentile:17.31(Physics, Nuclear)

Deuteron-induced nonelastic cross sections are studied in an extended intranuclear cascade (INC) model. A three-body framework of proton, neutron, and target is introduced into the INC model to incorporate naturally the decomposition and capture reactions from weakly bound deuterons. This framework includes three types of interaction potential, namely proton-target, neutron-target, and proton-neutron, the last of which causes the two nucleons in the deuteron to oscillate and play an important role in its breakup. The calculated results reproduce well the experimental data for $$^{12}$$C, $$^{40}$$Ca, $$^{58}$$Ni, and $$^{208}$$Pb targets with almost the same parameters as those determined previously for nucleon-induced nonelastic reactions.

Journal Articles

The JSNS$$^2$$ detector

Ajimura, Shuhei*; Haga, Katsuhiro; Harada, Masahide; Hasegawa, Shoichi; Kasugai, Yoshimi; Kinoshita, Hidetaka; Masuda, Shiho; Meigo, Shinichiro; Sakai, Kenji; Suzuya, Kentaro; et al.

Nuclear Instruments and Methods in Physics Research A, 1014, p.165742_1 - 165742_15, 2021/10

 Times Cited Count:25 Percentile:94.96(Instruments & Instrumentation)

Journal Articles

Analytical tool of evolution of topography and repository depth to assess impacts of uplift and erosion for HLW disposal

Yamaguchi, Masaaki; Kato, Tomoko; Suzuki, Yuji*; Makino, Hitoshi

Genshiryoku Bakkuendo Kenkyu (CD-ROM), 27(2), p.72 - 82, 2020/12

An efficient analytical tool to calculate temporal change of topography and repository depth due to uplift and erosion was developed for use in performance assessment of high level radioactive waste geological disposal. The tool was developed as ArcGIS model, incorporating simplified landform development simulation, to enable trial calculation of various conditions such as initial topography, uplift rate and its distributions, and repository location. This tool enables to support decision on which processes, features, and their changes should be taken into account for performance assessment, by calculating topography change and repository depth change under various conditions.

Journal Articles

Gas barrier properties of chemical vapor-deposited graphene to oxygen imparted with sub-electronvolt kinetic energy

Ogawa, Shuichi*; Yamaguchi, Hisato*; Holby, E. F.*; Yamada, Takatoshi*; Yoshigoe, Akitaka; Takakuwa, Yuji*

Journal of Physical Chemistry Letters (Internet), 11(21), p.9159 - 9164, 2020/11

 Times Cited Count:4 Percentile:18.74(Chemistry, Physical)

Atomically thin layers of graphene have been proposed to protect surfaces through the direct blocking of corrosion reactants such as oxygen with low added weight. The long term efficacy of such an approach, however, is unclear due to the long-term desired protection of decades and the presence of defects in as-synthesized materials. Here, we demonstrate catalytic permeation of oxygen molecules through previously-described impermeable graphene by imparting sub-eV kinetic energy to molecules. These molecules represent a small fraction of a thermal distribution thus this exposure serves as an accelerated stress test for understanding decades-long exposures. The permeation rate of the energized molecules increased 2 orders of magnitude compared to their non-energized counterpart. Graphene maintained its relative impermeability to non-energized oxygen molecules even after the permeation of energized molecules indicating that the process is non-destructive and a fundamental property of the exposed material.

Journal Articles

Stable structure of hydrogen atoms trapped in tungsten divacancy

Osawa, Kazuhito*; Toyama, Takeshi*; Hatano, Yuji*; Yamaguchi, Masatake; Watanabe, Hideo*

Journal of Nuclear Materials, 527, p.151825_1 - 151825_7, 2019/12

 Times Cited Count:10 Percentile:66.26(Materials Science, Multidisciplinary)

no abstracts in English

120 (Records 1-20 displayed on this page)