Measurement of Auger electrons emitted through Coster-Kronig transitions under irradiation of fast C ions

Shiina, Yoko*; Kinoshita, Ryo*; Funada, Shuhei*; Matsuda, Makoto; Imai, Makoto*; Kawatsura, Kiyoshi*; Sataka, Masao*; Sasa, Kimikazu*; Tomita, Shigeo*

Nuclear Instruments and Methods in Physics Research B, 460, p.30 - 33, 2019/12

https://doi.org/10.1016/j.nimb.2018.10.041

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

https://doi.org/10.1016/j.nimb.2015.08.010

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 10 cm, 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 () of Mn-doped ZnO follows the Curie law: = + C/T (i.e., paramagnetic) and the Curie constant C decreases to a half of that before irradiation (C = 0.012 emu cm K) at 100 MeV Xe ion fluence of 10 cm.

Temperature of thermal spikes in amorphous silicon nitride films produced by 1.11 MeV C 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

https://doi.org/10.1016/j.nimb.2014.11.002

Surface amorphization in AlO 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

https://doi.org/10.1016/j.nimb.2013.05.051

Microstructure in single crystal AlO 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.

Electronic stopping power dependence of ion-track size in UO irradiated with heavy ions in the energy range of 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

https://doi.org/10.1016/j.nimb.2013.05.038

In order to investigate electronic stopping power dependence of ion-track size in UO, ion-tracks in UO 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 is smaller than that obtained for CeO, 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 are discussed.

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

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

https://doi.org/10.1016/j.nimb.2010.05.080

We have studied electronic- and atomic-structure modifications of polycrystalline WO films (bandgap of 3 eV) by ion irradiation. WO films were prepared by oxidation of W films on MgO substrates and of W sheets. We find disordering or amorphization, the lattice expansion of 1.5% and bandgap increase of 0.2 eV after 90 MeV Ni ion irradiation at 3 10 cm. A broad peak of optical absorption appears around 1.6 m by ion irradiation. We also find that the erosion yield by high-energy ions with the equilibrium charge exceeds 10 and that the erosion yield under ion impact with non-equilibrium charge (90 MeV Ni) is 1/5 of that with the equilibrium charge (89 MeV Ni). 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.

On-line diffusion tracing in Li ionic conductors by the short-lived radioactive beam of 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

https://doi.org/10.1143/JJAP.47.6413

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

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

https://doi.org/10.1016/j.nimb.2008.03.183

Irradiation effects of CuO irradiated with 100 MeV Xe ions were studied. X-ray diffraction intensity and optical properties were analyzed.

Diffusion of 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