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Journal Articles

Effective Ruderman-Kittel-Kasuya-Yosida-like interaction in diluted double-exchange model; Self-learning Monte Carlo Approach

Koshiro, Hidehiko; Nagai, Yuki

Journal of the Physical Society of Japan, 90(3), p.034711_1 - 034711_8, 2021/03

no abstracts in English

Journal Articles

$$E1$$ and $$E2$$ cross sections of the $$^{12}$$C$$(alpha,gamma_{0})^{16}$$O reaction using pulsed $$alpha$$ beams

Makii, Hiroyuki; Nagai, Yasuki*; Shima, Tatsushi*; Segawa, Mariko; Mishima, Kenji*; Ueda, Hitoshi*; Igashira, Masayuki*; Osaki, Toshiro*

Physical Review C, 80(6), p.065802_1 - 065802_16, 2009/10

 Times Cited Count:30 Percentile:84.62(Physics, Nuclear)

We measured the $$gamma$$-ray angular distribution from $$^{12}$$C$$(alpha,gamma_{0})^{16}$$O to the ground state of $$^{16}$$O using a pulsed $$alpha$$ beam at $$E_{rm eff} = 1.6$$ and 1.4 MeV. True events of $$^{12}$$C$$(alpha,gamma_{0})^{16}$$O were discriminated from background events due to neutrons from $$^{13}$$C($$alpha,n$$)$$^{16}$$O with a time-of-flight method. The obtained $$gamma$$-ray spectrum with anti-Compton NaI(Tl) spectrometers showed a characteristic line shape from $$^{12}$$C$$(alpha,gamma_{0})^{16}$$O: the Doppler broadening and energy loss of $$alpha$$ particles in $$^{12}$$C targets. The astrophysical S factors for $$E1$$ and $$E2$$, $$S_{E1}(gamma_{0}:E_{rm eff})$$ and $$S_{E2}(gamma_{0}:E_{rm eff})$$, derived from the present cross sections are in excellent agreement with the values derived by $$R$$-matrix calculation of the $$beta$$-delayed $$alpha$$ spectrum of $$^{16}$$N, and by using the asymptotic normalization constant in the $$R$$-matrix fit.

Journal Articles

Role of multiparticle-multihole states in $$^{18,19}$$O in thermal neutron capture of $$^{18}$$O

Nagai, Yasuki*; Segawa, Mariko; Osaki, Toshiro*; Matsue, Hideaki; Muto, Kazuo*

Physical Review C, 76(5), p.051301_1 - 051301_6, 2007/11

 Times Cited Count:9 Percentile:58.39(Physics, Nuclear)

The primary $$E$$1 $$gamma$$-ray transition strength from the thermal neutron capture of $$^{18}$$O to the 3/2$$^{-}$$ state, 18 keV below the neutron threshold of $$^{19}$$O, was found to be about two hundred thousand times stronger than that to the 1/2$$^{-}$$ excited state, 729 keV below the threshold. In addition, the $$E$$1 strength from the 3/2$$^{-}$$ state leading to the 3/2$$^{+}$$ state with three ($$d$$$$_{5/2}$$)$$^{3}$$ neutrons was six times stronger than that to the 5/2$$^{+}$$ ground state with a single ($$d$$$$_{5/2}$$) neutron. These anomalous $$gamma$$-ray decay patterns give the first clear experimental evidence for the predicted property of the 3/2$$^{-}$$ state as mainly having a one-hole-four-particle configuration. Unique features of the $$^{18}$$O ground state with a two-hole-four-particle configuration and of the 3/2$$^{+}$$ state combined with a discrete prompt $$gamma$$-ray spectroscopy following the thermal neutron capture of $$^{18}$$O enabled us to exclusively identify the configuration of the 3/2$$^{-}$$ state.

Journal Articles

Minor actinide neutron capture cross-section measurements with a 4$$pi$$ Ge spectrometer

Koizumi, Mitsuo; Osa, Akihiko; Toh, Yosuke; Kimura, Atsushi; Mizumoto, Motoharu; Oshima, Masumi; Igashira, Masayuki*; Osaki, Toshiro*; Harada, Hideo*; Furutaka, Kazuyoshi*; et al.

Nuclear Instruments and Methods in Physics Research A, 562(2), p.767 - 770, 2006/06

 Times Cited Count:6 Percentile:45.27(Instruments & Instrumentation)

In order to measure the neutron capture cross section of minor actinides, we have proposed the use of a 4$$pi$$ Ge spectrometer. A Time-of-Flight neutron beam line for the experiment has been constructed at the KURRI electron LINAC. The assembling of the 4$$pi$$ Ge spectrometer is in progress. We are also developing a new data acquisition system based on a digital processing technique.

JAEA Reports

Study on neutron capture cross sections of long-lived fission products

Igashira, Masayuki*; Osaki, Toshiro*; Nagai, Yasuki*; Yamana, Hajimu*; Fujii, Toshiyuki*; Takamiya, Koichi*; Harada, Hideo; Furutaka, Kazuyoshi; Nakamura, Shoji

JNC TY8400 2005-009, 186 Pages, 2005/09

JNC-TY8400-2005-009.pdf:14.33MB

Accurate fast-neutron capture cross sections of long-lived fission products (LLFPs) are indispensable for the R&D of nuclear transmutation systems which utilize the fast-neutron capture reaction. The accuracy of those cross section data contained nuclear data libraries are, however, quite inadequate. Therefore, accurate experimental data on those cross sections are necessary as the basic data usefule for the evaluation of capture cross sections of LLFPs. The final goal of the present study is to obtain the results with the errors from 5 to 10% fore the fast-neutron capture cross sections of $$^{99}$$Tc and tentative results with the errors of about 10% for those of $$^{93}$$Zr, using the electron linear accelerator based neutron source at the Oak Ridege National Laboratory. For this goal, the four research items were executed: (1) the separation, purification and analysis of LLFP samples, (2) the improvement of weighting function of $$gamma$$-ray detector, (3) the measurement of fast-neutron capture cross sections of impurity isotopes in LLFP samples, and (4) the measurement of fast-neutron capture cross sections of $$^{99}$$Tc and $$^{93}$$Zr. The final goal was not reached due to the long-term trouble of the electron linear accelerator, but sufficient results were obtained for the other items. In particular, the present results for the capture cross sections and capture $$gamma$$-ray spectra of $$^{90,91,92,94}$$Zr wer important nuclear data for the R&D of nuclear transmutation systems.

Journal Articles

Simulation of 4$$pi$$ Ge spectrometer by Geant4

Goto, Jun; Sugawara, Masahiko*; Oshima, Masumi; Toh, Yosuke; Kimura, Atsushi; Osa, Akihiko; Koizumi, Mitsuo; Mizumoto, Motoharu; Osaki, Toshiro*; Igashira, Masayuki*; et al.

AIP Conference Proceedings 769, p.788 - 791, 2005/05

no abstracts in English

Journal Articles

NaCl-2CsCl Molten Salt Purification Technology in Dry Reprocessing Process; Phosphate Precipitation Experiment

Nagai, Takayuki; Kameshiro, Naoki*; Kobayashi, Yuichi*; Tanaka, Hitoshi*; Tayama, Toshimitsu; Myochin, Munetaka

Nihon Genshiryoku Gakkai Wabun Rombunshi, 2(3), p.269 - 278, 2003/09

None

JAEA Reports

Measurement of the iodine species in nitric acid solution under the irradiation of $$gamma$$-ray

Okagawa, Seigo; Nagai, Hitoshi*; Abe, Hitoshi*; Tashiro, Shinsuke

JAERI-Tech 2003-068, 17 Pages, 2003/08

JAERI-Tech-2003-068.pdf:0.78MB

To study the release mechanism of iodine from the dissolver solution in the nuclear fuel reprocessing plants to the atmosphere at criticality accidents, the characteristics of redox of iodine species in various solutions must be examined. In the present work, the effect of $$gamma$$-ray irradiation on the redox reaction was examined in the nitric acid solution of 1M and 3M. Without irradiation, most of iodine in 1M nitric acid solutions were exist in the form of I$$_{3}$$$$^{-}$$. In 3M nitric acid solutions, iodine was oxidized to I$$_{2}$$. When the solutions were irradiated by $$gamma$$-ray with exposure of more than 4C/kg, I$$_{3}$$$$^{-}$$ was disappeared regardless of nitric acid concentration. At exposure of 120C/kg, iodine was oxidized to IO$$_{3}$$$$^{-}$$. At exposure of 4800C/kg, iodine was exist in the form of IO$$_{3}$$$$^{-}$$ in 1M nitric acid solution. On the other hand, iodine in 3M nitric acid solution was reduced to I$$_{2}$$ at the same exposure. In the irradiated solution, nitrous acid was found, which would be produced from nitric acid by $$gamma$$-ray irradiation.

Journal Articles

The Kids' Science Musium of Photons

Nagai, Shiro

Hikari Araiansu, 12(12), p.34 - 36, 2001/12

no abstracts in English

Journal Articles

Effect of mass-selected ion species on structure and properties of diamond-like carbon films

Tang, Z.; Zhang, Z.; Narumi, Kazumasa; Xu, Y.; Naramoto, Hiroshi; Nagai, Shiro; Miyashita, Kiyoshi*

Journal of Applied Physics, 89(3), p.1959 - 1964, 2001/02

 Times Cited Count:26 Percentile:71.34(Physics, Applied)

no abstracts in English

Journal Articles

Varied-line-spacing laminar-type holographic grating for the standard soft X-ray flat-field spectrograph

Koike, Masato; Namioka, Takeshi*; Gullikson, E. M.*; Harada, Yoshihisa*; Ishikawa, Sadayuki*; Imazono, Takashi*; Mrowka, S.*; Miyata, Noboru; Yanagihara, Mihiro*; Underwood, J. H.*; et al.

Soft X-Ray and EUV Imaging Systems (Proceedings of SPIE Vol.4146), p.163 - 170, 2000/00

no abstracts in English

JAEA Reports

Study on the release behavior of radioactive iodine spices and noble gases from the fuel solution under simulated nuclear criticality accident (Contract research)

Abe, Hitoshi; Tashiro, Shinsuke; Nagai, Hitoshi; Koike, Tadao; Okagawa, Seigo; Murata, Mikio

JAERI-Tech 99-067, p.23 - 0, 1999/09

JAERI-Tech-99-067.pdf:1.37MB

no abstracts in English

Journal Articles

Growth of carbon thin film by low-energy mass-selected ion beam deposition

*; J.A.van-den-Berg*; Nagai, Shiro; D.G.Armour*

Nuclear Instruments and Methods in Physics Research B, 148, p.673 - 677, 1999/00

 Times Cited Count:23 Percentile:84.18(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Effect of fluence of He$$^{+}$$ ions on fluorescence intensity of triphenylmethyl radical

; Namba, Hideki; Aoki, Yasushi; Nagai, Shiro; *

Radiation Physics and Chemistry, 49(2), p.253 - 256, 1997/00

 Times Cited Count:3 Percentile:31.43(Chemistry, Physical)

no abstracts in English

Journal Articles

A SIMS study on secondary ion formation during low-enrgy methyl ion beam deposition

*; Aoki, Yasushi; Nagai, Shiro

Nuclear Instruments and Methods in Physics Research B, 108, p.75 - 80, 1996/00

 Times Cited Count:2 Percentile:32.32(Instruments & Instrumentation)

no abstracts in English

JAEA Reports

Low-energy ion-beam deposition apparatus equipped with surface analysis system

*; Aoki, Yasushi; Nagai, Shiro

JAERI-Research 94-018, 45 Pages, 1994/10

JAERI-Research-94-018.pdf:1.2MB

no abstracts in English

Journal Articles

A Luminescence study of ion-irradiated aromatic polymers

Aoki, Yasushi; Namba, Hideki; Hosoi, Fumio; Nagai, Shiro

ACS Symposium Series, 579; Polymeric Materials for Microelectronic Applications,Science and Technology, 0, p.45 - 50, 1994/00

no abstracts in English

Journal Articles

XPS and optical absorption studies on $$alpha$$-Al$$_{2}$$O$$_{3}$$ and MgO single crystals implanted with Cr, Cu and Kr ions

*; Aoki, Yasushi; Yoda, Osamu; Nagai, Shiro

Nuclear Instruments and Methods in Physics Research B, 88, p.261 - 266, 1994/00

 Times Cited Count:19 Percentile:83.17(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Thin film growth by low energy hydrocarbon ion deposition

*; Aoki, Yasushi; Nagai, Shiro

Dai-4-Kai Ryushisen No Sentanteki Oyo Gijutsu Ni Kansuru Shimpojiumu, p.175 - 178, 1993/00

no abstracts in English

Journal Articles

Technology information data base for social application of nuclear technology accumulation project

Nagai, Shiro; Yamagishi, Kojiro*

Genshiryoku Kogyo, 39(10), p.40 - 45, 1993/00

no abstracts in English

41 (Records 1-20 displayed on this page)