Refine your search:     
Report No.
 - 
Search Results: Records 1-20 displayed on this page of 99

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Temperature of thermal spikes induced by swift heavy ions

Matsuzaki, Shota*; Hayashi, Hiroaki*; Nakajima, Kaoru*; Matsuda, Makoto; Sataka, Masao*; Tsujimoto, Masahiko*; Toulemonde, M.*; Kimura, Kenji*

Nuclear Instruments and Methods in Physics Research B, 406(Part B), p.456 - 459, 2017/09

 Times Cited Count:3 Percentile:53.18(Instruments & Instrumentation)

Journal Articles

Ion induced modifications of Mn-doped ZnO films

Matsunami, Noriaki*; Ito, M.*; Kato, M.*; Okayasu, Satoru; Sataka, Masao*; Kakiuchida, Hiroshi*

Nuclear Instruments and Methods in Physics Research B, 365(Part A), p.191 - 195, 2015/12

 Times Cited Count:4 Percentile:55.82(Instruments & Instrumentation)

We have studied ion impact effects on atomic structure in terms of X-ray diffraction (XRD), optical absorption and electrical resistivity of Mn (6%)-doped ZnO films under 100 MeV Xe ion impact at room temperature. We find the monotonic reduction of the XRD intensity to 1/50 of that of unirradiated film at 5 $$times$$10$$^{14}$$ cm$$^{-2}$$, little bandgap change ($$<$$0.02 eV) and decrease of the resistivity by 4 order of magnitude. The resistivity modification has been compared with that by irradiations of low energy ions such as 100 keV Ne and N, which show more effective decrease of resistivity. We also find that temperature (T) dependence of the magnetic susceptibility ($$chi$$) of Mn-doped ZnO follows the Curie law: $$chi$$ = $$chi$$$$_{o}$$ + C/T (i.e., paramagnetic) and the Curie constant C decreases to a half of that before irradiation (C$$_{O}$$ = 0.012 emu cm$$^{-3}$$ K) at 100 MeV Xe ion fluence of 10$$^{12}$$ cm$$^{-2}$$.

Journal Articles

Temperature of thermal spikes in amorphous silicon nitride films produced by 1.11 MeV C$$_{60}^{3+}$$ impacts

Kitayama, Takumi*; Nakajima, Kaoru*; Suzuki, Motofumi*; Narumi, Kazumasa; Saito, Yuichi; Matsuda, Makoto; Sataka, Masao*; Tsujimoto, Masahiko*; Isoda, Shoji*; Kimura, Kenji*

Nuclear Instruments and Methods in Physics Research B, 354, p.183 - 186, 2015/07

 Times Cited Count:2 Percentile:75.47(Instruments & Instrumentation)

Journal Articles

Equilibrium and non-equilibrium charge-state distributions of 2.0 MeV/u carbon ions passing through carbon foils

Imai, Makoto*; Sataka, Masao*; Matsuda, Makoto; Okayasu, Satoru; Kawatsura, Kiyoshi*; Takahiro, Katsumi*; Komaki, Kenichiro*; Shibata, Hiromi*; Nishio, Katsuhisa

Nuclear Instruments and Methods in Physics Research B, 354, p.172 - 176, 2015/07

 Times Cited Count:8 Percentile:30.41(Instruments & Instrumentation)

Both equilibrium and non-equilibrium charge-state distributions were studied experimentally for 2.0 MeV/u carbon ions after passing through carbon foils. Measured charge-state distribution established the equilibrium at a target thickness of 10 $$mu$$g/cm$$^{2}$$ and this remained unchanged until a maximum target thickness of 98 $$mu$$g/cm$$^{2}$$. The equilibrium charge-state distribution, the equilibrium mean charge-state, and the width and skewness of the equilibrium distribution were compared with predictions using existing semi-empirical formulae as well as simulation results, including the ETACHA code. It was found that charge-state distributions, mean charge states, and distribution widths for C$$^{2+}$$, C$$^{3+}$$, and C$$^{4+}$$ incident ions merged into quasi-equilibrium values at a target thickness of 5.7 $$mu$$g/cm$$^{2}$$ in the pre-equilibrium region and evolved simultaneously to the "real equilibrium" values for all of the initial charge states, including C$$^{5+}$$ and C$$^{6+}$$ ions. Two kinds of simulation, ETACHA and solution of rate equations taking only single electron transfers into account, were used, and both of them reproduced the measured charge evolution qualitatively. The quasi-equilibrium behavior could be reproduced with the ETACHA code, but not with solution of elementary rate equations.

Journal Articles

Surface amorphization in Al$$_{2}$$O$$_{3}$$ induced by swift heavy ion irradiation

Okubo, Nariaki; Ishikawa, Norito; Sataka, Masao; Jitsukawa, Shiro

Nuclear Instruments and Methods in Physics Research B, 314, p.208 - 210, 2013/11

 Times Cited Count:11 Percentile:26.86(Instruments & Instrumentation)

Microstructure in single crystal Al$$_{2}$$O$$_{3}$$ specimens developed during irradiation by 70-160 MeV-Xe ions has been examined with transmission electron microscope (TEM). Amorphization was observed around 800 nm depth through from ion-beam incident surface of the specimen. The amorphization was also evaluated with XRD technique. TEM observation also indicated that tracks were formed by irradiation at the deeper region than that of the amorphous layers. The number density and size of the tracks have been decreased with the depth from the ion-incident surface. It suggests that amorphization has been occurred by the overlapping of the tracks. It was also obvious that the thickness of the amorphous layers were smaller than those observed in poly-crystal alumina specimens. This may be interpreted by the difference of electronic energy loss in the specimen; lower energy loss for single crystal specimens for their crystallographic orientation against to the incident ion-beam.

Journal Articles

Development of dual-beam system using an electrostatic accelerator for in-situ observation of swift heavy ion irradiation effects on materials

Matsuda, Makoto; Asozu, Takuhiro; Sataka, Masao; Iwase, Akihiro*

Nuclear Instruments and Methods in Physics Research B, 314, p.43 - 46, 2013/11

 Times Cited Count:0 Percentile:100(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Electronic stopping power dependence of ion-track size in UO$$_{2}$$ irradiated with heavy ions in the energy range of $$sim$$1MeV/u

Ishikawa, Norito; Sonoda, Takeshi*; Sawabe, Takashi*; Sugai, Hiroyuki*; Sataka, Masao*

Nuclear Instruments and Methods in Physics Research B, 314, p.180 - 184, 2013/11

 Times Cited Count:15 Percentile:17.65(Instruments & Instrumentation)

In order to investigate electronic stopping power dependence of ion-track size in UO$$_{2}$$, ion-tracks in UO$$_{2}$$ irradiated with various ions with the specific energy in the order of 1 MeV/u have been observed by a transmission electron microscope. The ion-tracksize shows monotonic increase as a function of the electronic stopping power. Theion-track size obtained for UO$$_{2}$$ is smaller than that obtained for CeO$$_{2}$$, although these two compounds have same crystallographic structure and similar thermal properties. The ion-track sizes for irradiations with ions having relatively low energy of about1 MeV/u are smaller than those expected from the thermal spike models based on melting temperature criterion. The possible interpretations for the unusually smallion-tracks observed for UO$$_{2}$$ are discussed.

Journal Articles

Development of one-accelerator-dual-beam system

Matsuda, Makoto; Asozu, Takuhiro; Sataka, Masao; Iwase, Akihiro*

Dai-25-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.94 - 97, 2012/07

no abstracts in English

Journal Articles

Development of ion beam applications for JAEA-Tokai tandem accelerator

Matsuda, Makoto; Asozu, Takuhiro; Sataka, Masao; Hanashima, Susumu; Nakamura, Masahiko; Kabumoto, Hiroshi; Kutsukake, Kenichi

Dai-23-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.65 - 68, 2011/07

no abstracts in English

Journal Articles

Electrical property modifications of In-doped ZnO Films by ion irradiation

Matsunami, Noriaki*; Fukushima, Junichi*; Sataka, Masao; Okayasu, Satoru; Sugai, Hiroyuki; Kakiuchida, Hiroshi*

Nuclear Instruments and Methods in Physics Research B, 268(19), p.3071 - 3075, 2010/10

 Times Cited Count:12 Percentile:31.38(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Ion irradiation effects on tungsten-oxide films and charge state effect on electronic erosion

Matsunami, Noriaki*; Sataka, Masao*; Okayasu, Satoru; Kakiuchida, Hiroshi*

Nuclear Instruments and Methods in Physics Research B, 268(19), p.3167 - 3170, 2010/10

 Times Cited Count:9 Percentile:41.34(Instruments & Instrumentation)

We have studied electronic- and atomic-structure modifications of polycrystalline WO$$_{3}$$ films (bandgap of $$sim$$ 3 eV) by ion irradiation. WO$$_{3}$$ films were prepared by oxidation of W films on MgO substrates and of W sheets. We find disordering or amorphization, the lattice expansion of $$sim$$ 1.5% and bandgap increase of 0.2 eV after 90 MeV Ni ion irradiation at $$sim$$ 3 $$times$$ 10$$^{12}$$ cm$$^{2}$$. A broad peak of optical absorption appears around 1.6 $$mu$$m by ion irradiation. We also find that the erosion yield by high-energy ions with the equilibrium charge exceeds 10$$^{4}$$ and that the erosion yield under ion impact with non-equilibrium charge (90 MeV Ni$$^{+10}$$) is $$sim$$ 1/5 of that with the equilibrium charge (89 MeV Ni$$^{+19}$$). Effects of depth dependence of the ion mean charge on the erosion yields are discussed. The erosion yield by low-energy ions is also presented.

Journal Articles

Present status of JAEA-Tokai Tandem Accelerator

Matsuda, Makoto; Sataka, Masao; Tsukihashi, Yoshihiro; Hanashima, Susumu; Abe, Shinichi; Osa, Akihiko; Ishizaki, Nobuhiro; Nakanoya, Takamitsu; Kabumoto, Hiroshi; Nakamura, Masahiko; et al.

JAEA-Conf 2008-012, p.39 - 43, 2009/03

no abstracts in English

Journal Articles

On-line diffusion tracing in Li ionic conductors by the short-lived radioactive beam of $$^{8}$$Li

Jeong, S.-C.*; Katayama, Ichiro*; Kawakami, Hirokane*; Watanabe, Yutaka*; Ishiyama, Hironobu*; Imai, Nobuaki*; Hirayama, Yoshikazu*; Miyatake, Hiroari; Sataka, Masao; Sugai, Hiroyuki; et al.

Japanese Journal of Applied Physics, 47(8), p.6413 - 6415, 2008/08

 Times Cited Count:5 Percentile:75.28(Physics, Applied)

A non-destructive and on-line diffusion tracing in Li ionic conductors has been demonstrated. As a tracer, pulsed beam of $$^{8}$$Li was implanted into LiGa. By analyzing the time dependent yield of the $$alpha$$-particles decaying from $$^{8}$$Li, diffusion coefficients were extracted with a high accuracy. The ordering of Li vacancies in the Li-deficient $$beta$$ phase of LiGa was observed for the first time in terms of the Li diffusion.

Journal Articles

Clarification of the properties and accumulation effects of ion tracks in CeO$$_{2}$$

Sonoda, Takeshi*; Kinoshita, Motoyasu*; Ishikawa, Norito; Sataka, Masao; Chimi, Yasuhiro; Okubo, Nariaki; Iwase, Akihiro*; Yasunaga, Kazufumi*

Nuclear Instruments and Methods in Physics Research B, 266(12-13), p.2882 - 2886, 2008/06

 Times Cited Count:26 Percentile:13.16(Instruments & Instrumentation)

High-energy particle irradiation effects of CeO$$_{2}$$ is investigated using electron microscopy. It is found that ion track is formed only when the electronic energy transfer exceeds 16 keV/nm.

Journal Articles

High-energy ion irradiation effects on atomic structures and optical properties of copper oxide and electronic sputtering

Matsunami, Noriaki*; Sataka, Masao; Okayasu, Satoru; Ishikawa, Norito; Tazawa, Masato*; Kakiuchida, Hiroshi*

Nuclear Instruments and Methods in Physics Research B, 266(12-13), p.2986 - 2989, 2008/06

 Times Cited Count:6 Percentile:54.25(Instruments & Instrumentation)

Irradiation effects of Cu$$_{2}$$O irradiated with 100 MeV Xe ions were studied. X-ray diffraction intensity and optical properties were analyzed.

Journal Articles

Present status of JAEA-Tokai tandem accelerator

Matsuda, Makoto; Sataka, Masao; Takeuchi, Suehiro; Tsukihashi, Yoshihiro; Hanashima, Susumu; Abe, Shinichi; Osa, Akihiko; Ishizaki, Nobuhiro; Tayama, Hidekazu; Nakanoya, Takamitsu; et al.

JAEA-Conf 2008-005, p.42 - 45, 2008/03

In FY2006, a tandem accelerator was operated for 201days. The maximum voltage was 18 MV and the accelerated ion species was 19 elements (26 nuclides). As the trouble case which occurred previous year, the change of the beam shape occurred often in the injection beam line of the tandem accelerator. The cause was the contact failure of the pole connector of the electrostatics quadrupole lens. Generally, it was difficult to confirm the connection status of the opened pole but we specified a connection abnormal part by the capacitive coupling method. This technique is useful technology which can be applied to the other electrostatics optics elements. Because the charging electric current flowed only about usual about 60% and the terminal voltage became unstable, we opened a tank and checked the charging system. As a result, a problem was confirmed to the damaging of resistance and the installation of the cable. In the seminar, the operation, maintenance and the accelerator development of the tandem accelerator in FY2006 are described.

Journal Articles

Diffusion of $$^{8}$$Li short-lived radiotracer in Li ionic conductors of NaTl-type intermetallic compounds

Sugai, Hiroyuki; Sataka, Masao; Okayasu, Satoru; Ichikawa, Shinichi; Nishio, Katsuhisa; Mitsuoka, Shinichi; Nakanoya, Takamitsu; Osa, Akihiko; Sato, Tetsuya; Hashimoto, Takashi; et al.

Defect and Diffusion Forum, 273-276, p.667 - 672, 2008/00

Journal Articles

X-ray diffuse scattering from carbon-ion-irradiated diamond

Sugai, Hiroyuki; Maeta, Hiroshi*; Matsumoto, Norimasa*; Kato, Teruo; Haruna, Katsuji*; Sataka, Masao; Ono, Fumihisa*

Physica Status Solidi (C), 4(8), p.2963 - 2966, 2007/07

 Times Cited Count:0 Percentile:100

The synthetic semiconductor diamond is potentially one of the best materials for electronic devices in severe environments like high temperature and radiation. We have studied the electrical transport properties of boron-doped synthetic semiconductor diamond and characterized natural and synthetic single crystal diamonds by measurements of the X-ray integrated scattering intensity, lattice parameter and diffuse scattering. The synthetic diamond were irradiated with 100 MeV carbon-ion at Tandem accelerator in JAEA-Tokai. After the irradiation, measurements of lattice parameters X-ray diffuse scattering were made at room temperature. The lattice parameters increased with ion fluence. The scattering intensity of the irradiated synthetic diamond diffuses asymmetrically to form a streak along the [-1 0 0] direction parallel to the reciprocal lattice vector. The result suggests that interstitial atoms and vacancies aggregate to form dislocation loop on the (100) plane.

Journal Articles

Electronic sputtering of nitrides by high-energy ions

Matsunami, Noriaki*; Sataka, Masao; Okayasu, Satoru; Tazawa, Masato*

Nuclear Instruments and Methods in Physics Research B, 256(1), p.333 - 336, 2007/03

 Times Cited Count:13 Percentile:29.84(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Charge state evolution of 2MeV/u sulfur ion passing through thin carbon foil

Imai, Makoto*; Sataka, Masao; Kawatsura, Kiyoshi*; Takahiro, Katsumi*; Komaki, Kenichiro*; Shibata, Hiromi*; Sugai, Hiroyuki; Nishio, Katsuhisa

Nuclear Instruments and Methods in Physics Research B, 256(1), p.11 - 15, 2007/03

 Times Cited Count:5 Percentile:57.07(Instruments & Instrumentation)

no abstracts in English

99 (Records 1-20 displayed on this page)