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-Orbital component in the Borromean nucleus 
BYang, Z. H.*; Kubota, Yuki*; Corsi, A.*; Yoshida, Kazuki; Sun, X.-X.*; Li, J. G.*; Kimura, Masaaki*; Michel, N.*; Ogata, Kazuyuki*; Yuan, C. X.*; et al.
Physical Review Letters, 126(8), p.082501_1 - 082501_8, 2021/02
Times Cited Count：45 Percentile：96.7(Physics, Multidisciplinary)A quasifree (
,
) experiment was performed to study the structure of the Borromean nucleus B, which had long been considered to have a neutron halo. By analyzing the momentum distributions and exclusive cross sections, we obtained the spectroscopic factors for 
and 
orbitals, and a surprisingly small percentage of 9(2)% was determined for . Our finding of such a small component and the halo features reported in prior experiments can be explained by the deformed relativistic Hartree-Bogoliubov theory in continuum, revealing a definite but not dominant neutron halo in B. The present work gives the smallest - or -orbital component among known nuclei exhibiting halo features and implies that the dominant occupation of or orbitals is not a prerequisite for the occurrence of a neutron halo.
Hasegawa, Mika*; Sugawara, Kenta*; Suto, Ryota*; Sambonsuge, Shota*; Teraoka, Yuden; Yoshigoe, Akitaka; Filimonov, S.*; Fukidome, Hirokazu*; Suemitsu, Maki*
Nanoscale Research Letters, 10, p.421_1 - 421_6, 2015/10
Times Cited Count：14 Percentile：52.35(Nanoscience & Nanotechnology)Graphene has attracted much attention as a promising material in electronics and photonics. The graphitization temperature of 1473 K or higher of graphene-on-silicon(GOS), however, is still too high to be fully compatible with the Si technology. Here, the first application of Ni-assisted formation of graphene to the GOS method was reported. We demonstrate that the graphene formation temperature can be reduced by more than 200 K by this method. Moreover, solid-phase reactions during heating/annealing/cooling procedures have been investigated in detail by using 
synchrotron-radiation X-ray photoelectron spectroscopy. As a result, we clarify the role of Ni/SiC reactions, in which not only Ni silicidation and but also Ni carbonization is suggested as a key process in the formation of graphene.
Hama, Katsuhiro; Mikake, Shinichiro; Nishio, Kazuhisa; Kawamoto, Koji; Yamada, Nobuto; Ishibashi, Masayuki; Murakami, Hiroaki; Matsuoka, Toshiyuki; Sasao, Eiji; Sanada, Hiroyuki; et al.
JAEA-Review 2014-038, 137 Pages, 2014/12
JAEA-Review-2014-038.pdf:162.61MB
Japan Atomic Energy Agency (JAEA) at Tono Geoscience Center (TGC) is pursuing a geoscientific research and development project namely the Mizunami Underground Research Laboratory (MIU) Project in crystalline rock environment in order to construct scientific and technological basis for geological disposal of High-level Radioactive Waste (HLW). The MIU Project has three overlapping phases: Surface-based Investigation phase (Phase I), Construction phase (Phase II), and Operation phase (Phase III). The MIU Project has been ongoing the Phase II and the Phase III in fiscal year 2013. This report presents the results of the investigations, construction and collaboration studies in fiscal year 2013, as a part of the Phase II and Phase III based on the MIU Master Plan updated in 2010.
Kawachi, Tetsuya; Hasegawa, Noboru; Nishikino, Masaharu; Ishino, Masahiko; Imazono, Takashi; Oba, Toshiyuki; Kaihori, Takeshi; Kishimoto, Maki; Ochi, Yoshihiro; Tanaka, Momoko; et al.
X-Ray Lasers 2010; Springer Proceedings in Physics, Vol.136, p.15 - 24, 2011/12
This paper reviews recent improvement in the source development of laser-driven X-ray lasers and the applications in the research fields of material science, laser processing, X-ray imaging, and radiation damage in biological cells. In the application for material science, we have firstly observed temporal correlation between the domain structures of ferro-electric substance under the Curie temperature. In the laser processing, new X-ray laser interferometer reveals us the nano-scale surface distortion of substance pumped by a femto-second optical pulse. In the X-ray diffraction image, we have taken several static images of micro-structure of samples: now we are trying to extend the objective to nano-scale dynamics using pump and probe method. In the radiation damage of biological cells, we observed double strand break in DNA using X-ray laser exposure; this results are compared with the case using incoherent several KeV X-ray exposure.
Kishimoto, Maki; Namikawa, Kazumichi*; Sukegawa, Kota*; Yamatani, Hiroshi*; Hasegawa, Noboru; Tanaka, Momoko
Review of Scientific Instruments, 81(1), p.013905_1 - 013905_5, 2010/01
Times Cited Count：3 Percentile：18.27(Instruments & Instrumentation)We developed a new soft X-ray speckle intensity correlation spectroscopy system by use of a single shot high brilliant plasma soft X-ray laser. The plasma soft X-ray laser is characterized by several picoseconds in pulse width, more than 90% special coherence, and 10
soft X-ray photons within a single pulse. We developed a Michelson type delay pulse generator using a soft X-ray beam splitter to measure the intensity correlation of X-ray speckles from materials and succeeded in generating double coherent X-ray pulses with picosecond delay times. Moreover, we employed a high-speed soft X-ray streak camera for the picosecond time-resolved measurement of X-ray speckles. We performed the X-ray speckle intensity correlation measurements for probing the relaxation phenomena of polarizations in polarization clusters in the paraelectric phase of the ferroelectric material BaTiO
near its Curie temperature and verified its performance.
Kawachi, Tetsuya; Nagashima, Keisuke; Kishimoto, Maki; Hasegawa, Noboru; Tanaka, Momoko; Ochi, Yoshihiro; Nishikino, Masaharu; Kawazome, Hayato; Tai, R.; Namikawa, Kazumichi*; et al.
Proceedings of SPIE's International Symposium on Optics and Photonics 2005, Vol.5919, p.59190L_1 - 59190L_11, 2005/09
Recent results of the X-ray laser research in Advanced Photon Research (APR) Center in JAERI are reported. In the application of the nickel-like silver laser at a wavelength of 13.9 nm, we report the observation of the microscopic polarization clusters in ferroelectrics material such as BaTi03 by use of the X-ray speckle technique, and other experiments such as photo-ionization of inner-shell electrons are intoroduced. In the development of high quality X-ray laser beam, recently we demonstrated temporally coherent X-ray beam at 23.6 nm, in which the high-order harmonics light was injected into the Ne-like Mn X-ray amplifier. We also mention about the development of new X-ray laser driver laser, which is based on 2 beams of zig-zag slab Nd:glass lasers with 0.1 Hz repetition-rate, and each beam line can provide 10 J output energy, and 1 ps duration.
by means of X-ray lasersTai, R.; Namikawa, Kazumichi*; Kishimoto, Maki; Tanaka, Momoko; Sukegawa, Kota*; Hasegawa, Noboru; Kawachi, Tetsuya; Kado, Masataka; Lu, P.; Nagashima, Keisuke; et al.
Physical Review Letters, 89(25), p.257602_1 - 267602_4, 2002/12
Times Cited Count：40 Percentile：81.14(Physics, Multidisciplinary)no abstracts in English
Kato, Yoshiaki; Daido, Hiroyuki; Nagashima, Keisuke; Kawachi, Tetsuya; Hasegawa, Noboru; Tanaka, Momoko; Tang, H.; Tai, R.; Lu, P.; Kishimoto, Maki; et al.
AIP Conference Proceedings 641, p.31 - 39, 2002/00
no abstracts in English
Kawachi, Tetsuya; Kishimoto, Maki; Kado, Masataka; Tanaka, Momoko; Hasegawa, Noboru; Ochi, Yoshihiro; Nishikino, Masaharu; Ishino, Masahiko; Imazono, Takashi; Kunieda, Yuichi; et al.
no journal, ,
Recent progress in X-ray laser research in Japan Atomic Energy Agency is reviewed. Using the nickel-like silver soft X-ray laser at the wavelength of 13.9 nm, the application experiments have been conducted in the research fields such as material science, high-density plasma diagnostics, XRL ablation, XRL imaging using single-shot holography and atomic physics. The repetition rate of the XRL beam has been improved from each 10-20 minutes to 0.1 Hz by using new driver laser system with Nd: glass zigzag slab amplifier, and we are now constructing new beam line for the pump-probe measurement of the surface phase-transition by the method of X-ray laser interferometer. In the research activity on the extension of the wavelength region of the X-ray lasers, firstly, the demonstration of novel coherent X-ray generation by "flying mirror" technique is reported. The second is theoretical investigation of the resonance photo-pumping scheme toward water-window region.
Nishikino, Masaharu; Ochi, Yoshihiro; Hasegawa, Noboru; Kawachi, Tetsuya; Ishino, Masahiko; Imazono, Takashi; Tanaka, Momoko; Sato, Katsutoshi; Yamamoto, Minoru; Oba, Toshiyuki; et al.
no journal, ,
Recent Progress in the development of laser-driven plasma soft X-ray laser (XRL) and the applications are presented. In the source development, TOPAZ laser using Nd:glass zigzag slab amplifiers with 10 J, 0.1 Hz repetition-rate routinely provides the fully spatial coherent X-ray laser at 13.9 nm for the applications. The bright, coherent, and picoseconds X-ray pulse can be used in a variety of applications such as X-ray speckle measurement and interferometer for probing materials, diffraction imaging, nano-scale fabrication, radiation biology, and so on. In order to extend the use of XRLs, now we are constructing new XRL beam lines for the optical pump and XRL probe experiment.
Kado, Masataka; Kawachi, Tetsuya; Ochi, Yoshihiro; Nishikino, Masaharu; Ishino, Masahiko; Imazono, Takashi; Sasaki, Akira; Hasegawa, Noboru; Kishimoto, Maki; Tanaka, Momoko; et al.
no journal, ,
Full coherent X-ray laser operating at 0.1 Hz are realized with originally developed high power laser system and double-target amplification scheme at JAEA. Utilizing the high spatial coherent several applications have been done recently such as study of temporal correlation of the domain fluctuation of BaTiO with X-ray speckle measurement and X-ray interferometric measurement of nano-scale dynamics of solid surface with X-ray interferometer. Irradiating the X-ray laser onto biological cells DNA radiation damages showed different features comparing ordinary X-ray sources. Recent progress of X-ray laser development at JAEA and its applications will be presented.
Nishikino, Masaharu; Hasegawa, Noboru; Ochi, Yoshihiro; Kawachi, Tetsuya; Ishino, Masahiko; Imazono, Takashi; Tanaka, Momoko; Sasaki, Akira; Sato, Katsutoshi; Yamamoto, Minoru; et al.
no journal, ,
no abstracts in English
Enrichment study for paddy rice with a focus on its effect on nitrogen cycleHayashi, Kentaro*; Hasegawa, Toshihiro*; Tokida, Takeshi*; Ono, Keisuke*; Matsuda, Kazuhide*; Toyoda, Sakae*; Yano, Midori*; Sudo, Shigeto*; Wagai, Rota*; Matsushima, Miwa*; et al.
no journal, ,
National Institute for Agro-Environmental Sciences, Japan, established new Free-Air CO Enrichment (FACE) facilities for paddy rice in central Japan (Tsukuba FACE) in April, 2010. Early FACE studies were originally designed to investigate changes in plant growth, crop yield, and carbon cycle under elevated CO and temperature. In addition to these research agenda, a three-year project at Tsukuba FACE that assesses the changes in nitrogen cycle due to climate manipulation (FACE-N) started in April, 2010. The FACE-N project has the following themes: (1) atmosphere-paddy exchange of nitrogen; (2) nitrogen-related processes in a soil-rice system; and (3) development of the sophisticated nitrogen cycling model at a plot scale and of the regional nitrogen assessment system using remote-sensing technique and geographic information system (GIS).
Kawachi, Tetsuya; Sasaki, Akira; Nishikino, Masaharu; Ishino, Masahiko; Hasegawa, Noboru; Imazono, Takashi; Ochi, Yoshihiro; Tanaka, Momoko; Faenov, A. Ya.*; Pikuz, T.; et al.
no journal, ,
This paper reviews recent progress in the X-ray laser research in JAEA. In the source development, the polarization of the 13.9 nm laser has been investigated experimentally. The result indicates that the output beam is strongly polarized in the direction perpendicular to the target surface. In the alternative schemes toward the shorter wavelength region, intense higher-order harmonics with more than 300 eV has been observed from relativistic plasma generated with the laser intensity higher than 1E19 W/cm
. Furthermore, theoretical investigations of resonantly photo-pumping scheme using intense K-alpha line and generation of 
-ray flash induced by radiation damping effect are also studied. In the application study, the surface dynamics of metal plate irradiated by an optical pulse observed by X-ray laser interferometer, surface deformation induced by a single-shot XRL exposure in which nano-scale conical structures are formed, will be reported.
Iwatsuki, Teruki; Sato, Toshinori; Takeuchi, Ryuji; Onoe, Hironori; Onuki, Kenji; Saegusa, Hiromitsu; Hasegawa, Takashi; Kuroiwa, Hiroshi; Tsuyuguchi, Koji; Ikeda, Koki; et al.
no journal, ,
Closure experiment of gallery of MIU is planned to understand the recovery process of geological environments after the closure. Flooding test gallery and monitoring boreholes are designed at 500 m access gallery to observe recovery of water pressure, chemistry around cement and burial materials, rock stress. Evaluation of numerical analysis methods on hydraulic, chemical and mechanical change will be conducted based on the results of upcoming closure experiment.
Hasegawa, Mika*; Sugawara, Kenta*; Suto, Ryota*; Sambonsuge, Shota*; Haramoto, Naoki*; Teraoka, Yuden; Yoshigoe, Akitaka; Fukidome, Hirokazu*; Suemitsu, Maki*
no journal, ,
no abstracts in English
Hasegawa, Mika*; Sugawara, Kenta*; Suto, Ryota*; Sambonsuge, Shota*; Haramoto, Naoki*; Teraoka, Yuden; Yoshigoe, Akitaka; Fukidome, Hirokazu*; Suemitsu, Maki*
no journal, ,
no abstracts in English
Hasegawa, Mika*; Suto, Ryota*; Sugawara, Kenta*; Sambonsuge, Shota*; Haramoto, Naoki*; Teraoka, Yuden; Yoshigoe, Akitaka; Fukidome, Hirokazu*; Suemitsu, Maki*
no journal, ,
no abstracts in English
Mikami, Katsuhiro; Hasegawa, Noboru; Okada, Hajime; Kondo, Shuji; Kawachi, Tetsuya
no journal, ,
An outdoor-use laser system to improve the performances of existing tunnel inspection techniques is studied. One of the typical concepts is that the blow by hammer in routine hammering test is replaced by the laser pulse irradiation. This new laser system is required to provide high average output power (5 J, 50 Hz, 
15 ns) with a compact geometry enough to mount on the inspection vehicle (4.2 m 
0.8 m). Dramatic speed-up of the inspection is expected by the combination of this new laser system and a laser scanning frequency measurement system.
Mikami, Katsuhiro; Hasegawa, Noboru; Okada, Hajime; Kondo, Shuji; Kawachi, Tetsuya
no journal, ,
An outside-use laser system to improve the performances of existing tunnel inspection techniques is studied. One of the typical concepts is that the blow by hammer in routine test is replaced by the laser pulse irradiation. This new laser system is required to provide high average output power (5 J, 50 Hz, 15 ns) with a small-scale geometry enough to mount on the inspection vehicle (4.2 m 0.8 m). In this presentation, we will report a potential to demonstrate 5 J output.
