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Journal Articles

Estimation of reliable displacements-per-atom based on athermal-recombination-corrected model in radiation environments at nuclear fission, fusion, and accelerator facilities

Iwamoto, Yosuke; Meigo, Shinichiro; Hashimoto, Shintaro

Journal of Nuclear Materials, 538, p.152261_1 - 152261_9, 2020/09

 Times Cited Count:0 Percentile:100(Materials Science, Multidisciplinary)

The displacements-per-atom (dpa) is widely used as an exposure unit to predict the operating lifetime of materials in radiation environments. Because the athermal-recombination-corrected dpa (arc-dpa) model is a more realistic model than the standard Norgertt-Robinson-Torrens (NRT) model, new evaluation of radiation damage will be performed using the arc-dpa model as a standard. In this work, the recent arc-dpa model of various materials are incorporated in PHITS, and the rescaling factors (NRT-dpa/arc-dpa) over a wide energy range are reported. For neutron incidences with the energy spectrum determined in selected nuclear facilities and proton incidences with energies of 600 MeV-50 GeV, the rescaling factor for each material is independent of these irradiation conditions with almost the same value for each material. Our findings will be beneficial for rescaling the NRT-dpa model used for radiation damage applications over a wide energy region.

Journal Articles

Structure of $$^{55}$$Sc and development of the $$N=34$$ subshell closure

Steppenbeck, D.*; Takeuchi, Satoshi*; Aoi, Nori*; Doornenbal, P.*; Matsushita, Masafumi*; Wang, H.*; Baba, Hidetada*; Go, Shintaro*; Holt, J. D.*; Lee, J.*; et al.

Physical Review C, 96(6), p.064310_1 - 064310_10, 2017/12

 Times Cited Count:8 Percentile:24.79(Physics, Nuclear)

no abstracts in English

Journal Articles

Superdeformation in $$^{35}$$S

Go, Shintaro*; Ideguchi, Eiji*; Yokoyama, Rin*; Kobayashi, Motoki*; Kisamori, Keiichi*; Takaki, Motonobu*; Miya, Hioyuki*; Ota, Shinsuke*; Michimasa, Shinichiro*; Shimoura, Susumu*; et al.

JPS Conference Proceedings (Internet), 6, p.030005_1 - 030005_4, 2015/06

Journal Articles

Low-lying structure of $$^{50}$$Ar and the $$N$$=32 subshell closure

Steppenbeck, D.*; Takeuchi, Satoshi*; Aoi, Nori*; Doornenbal, P.*; Matsushita, Masafumi*; Wang, H.*; Utsuno, Yutaka; Baba, Hidetada*; Go, Shintaro*; Lee, J.*; et al.

Physical Review Letters, 114(25), p.252501_1 - 252501_6, 2015/06

 Times Cited Count:27 Percentile:13.39(Physics, Multidisciplinary)

The neutron-rich nucleus $$^{50}$$Ar is produced by the fragmentation reactions of $$^{54}$$Ca, $$^{55}$$Sc, and $$^{56}$$Ti at the RIBF facility in RIKEN, and its deexcited $$gamma$$ rays are observed for the first time. The first $$2^+$$ level in $$^{50}$$Ar is identified to lie at 1178(18)keV from the most intense $$gamma$$-ray spectra. This experimental data, together with the systematics of the $$2^+$$ levels for surrounding nuclei, is analyzed with large-scale shell-model calculations. Consequently, the $$N=32$$ sub-shell gap in $$^{50}$$Ar is equivalent to that of $$^{52}$$Ca, thus making the $$2^+$$ level in $$^{50}$$Ar higher than that of $$^{48}$$Ar. The shell-model calculation also predicts that the $$N=34$$ sub-shell gap enhances in going from Ca to Ar, which will be verified by forthcoming experiments for $$^{52}$$Ar.

Journal Articles

Evidence for a new nuclear "magic number" from the level structure of $$^{54}$$Ca

Steppenbeck, D.*; Takeuchi, Satoshi*; Aoi, Nori*; Doornenbal, P.*; Matsushita, Masafumi*; Wang, H.*; Baba, Hidetada*; Fukuda, Naoki*; Go, Shintaro*; Homma, Michio*; et al.

Nature, 502(7470), p.207 - 210, 2013/10

 Times Cited Count:198 Percentile:0.25(Multidisciplinary Sciences)

no abstracts in English

Journal Articles

Effect of seawater temperature on uranium recovery from seawater using amidoxime adsorbents

*; Saito, Kyoichi*; *; Furusaki, Shintaro*; Sugo, Takanobu; *

Industrial & Engineering Chemistry Research, 33(3), p.662 - 666, 1994/00

 Times Cited Count:62 Percentile:5.76(Engineering, Chemical)

no abstracts in English

Journal Articles

Effect of vapor-and liquid-phase radiation grafting on water permeability of porous hollow-fiber membrane

*; Saito, Kyoichi*; Furusaki, Shintaro*; Sugo, Takanobu; Okamoto, Jiro

Nippon Kagakkai-Shi, 1988(2), p.212 - 216, 1988/00

no abstracts in English

Journal Articles

Adsorption equilibrium of uranium from seawater on chelating resin containing amide oxime group

Hori, Takahiro*; Saito, Kyoichi*; Furusaki, Shintaro*; Sugo, Takanobu; Okamoto, Jiro

Kagaku Kogaku Rombunshu, 13(6), p.795 - 800, 1987/12

 Times Cited Count:7 Percentile:41.08(Engineering, Chemical)

Chelating resins containing amide

Journal Articles

Porous amidoxime-group-containing membrane for the recovery of uranium from seawater

Saito, Kyoichi*; Hori, Takahiro*; Furusaki, Shintaro*; Sugo, Takanobu; Okamoto, Jiro

Industrial & Engineering Chemistry Research, 26(10), p.1977 - 1981, 1987/10

 Times Cited Count:59 Percentile:5.87(Engineering, Chemical)

A porous, amidoxime-group-containing membrane was prepared by radiation-induced grafit polymerization of acrylonitrile onto porous polyethylene film followed by chemical conversion of the produced cyano group to an amidoxime group.

Journal Articles

Characteristics of uranium adsorption by amidoxime membrane synthesized by radiation-induced graft polymerization

Saito, Kyoichi*; Yamada, Shinji*; Furusaki, Shintaro*; Sugo, Takanobu; Okamoto, Jiro

J. Membr. Sci., 34(2), p.307 - 315, 1987/00

 Times Cited Count:35 Percentile:11.95(Engineering, Chemical)

Chelating membranes containing amidoxime groups for the recovery of uranium were synthesized by teh radiation-induced graft polymerization of acrylonitrile onto high- and low-density polyethylene films, followed by amidoximation of the cyano groups.

Journal Articles

Development of hollow fiber membrane for collecting ions

Furusaki, Shintaro*; Okamoto, Jiro; Sugo, Takanobu; Saito, Kyoichi*

Kemikaru Enjiniyaringu, 32(7), p.521 - 524, 1987/00

no abstracts in English

Oral presentation

Calculations of damage energy spectra of nuclear reaction products and plan for displacement damage cross section measurements using 120 GeV protons at FNAL

Iwamoto, Yosuke; Hashimoto, Shintaro; Yoshida, Makoto*; Iwamoto, Hiroki; Meigo, Shinichiro; Yonehara, Katsuya*; Spina, T.*; Hurh, P.*

no journal, , 

For defect production, it is the number of recoils weighted by the damage energy produced in each recoil that is most important. This quantity is determined by "weighed" the recoil spectra by the damage energy produced in each recoil. However, the damage energy spectra have not been investigated yet for the proton energy range from several MeV to hundred GeV, where recoil is regarded as nuclear reaction product. In this work, we calculated damage energy spectra of all nuclear reaction products under high energy proton irradiation on tungsten with the energy range from 10 MeV to 120 GeV using the PHITS code. The average damage energy of tungsten was 30-80 keV including nuclear elastic and non-elastic components and that of lutetium was 550-900 keV including non-elastic component. In this presentation, we will also introduce our experimental plan for measurement of dpa cross sections with 120 GeV protons at Fermi National Accelerator Laboratory (FNAL).

Oral presentation

Calculations of dpa based on new athermal recombination correction model in various environments

Iwamoto, Yosuke; Meigo, Shinichiro; Hashimoto, Shintaro

no journal, , 

The displacement per atom (dpa) value defined by the conventional model (NRT) has been used as an index of radiation damage in materials. On the other hands, athermal recombination correction between interstitial atom and vacancy obtained by Molecular dynamics was reported by Nordlund et al. in 2018. In this study, we calculated the arc-dpa and NRT-dpa for nuclear reactor, fusion reactor and accelerator facilities using PHITS. As a result, the scaling factor (NRT-dpa/arc-dpa) of Al, Fe, Cu and W are almost same for neutrons and 1 and 50 GeV protons irradiation. These values ranges from 1.5 to 6.0 and the NRT-dpa is larger than arc-dpa for all cases.

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