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press2016.8.26
Establishing a new method to take nuclear fission data
- Opening a new region for fission research -
Katsuhisa Nishio etc
Research Group for Heavy Element Nuclear Science
A new method to obtain fission fragment mass distributions using multi-nucleon transfer reactions was established, which generates data for more than fourteen nuclei at once including neutron-rich nuclei not investigated so far. A fluctuation-dissipation model successfuly explains the measured data.A new method to obtain fission fragment mass distributions using multi-nucleon transfer reactions was established, which generates data for more than fourteen nuclei at once including neutron-rich nuclei not investigated so far. A fluctuation-dissipation model successfuly explains the measured data.
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press2016.5.10
New technology for migration control of cesium from forests to living area. Regeneration of village forests by using natural force with polymers and clay. Evolving verification tests in Iitate village, etc., Fukushima. Expectation for prevention of recontamination of living area.
Hirochika Naganawa etc
Research Group for Interfacial reaction-field chemistry
New technology for migration control of cesium from forests to living area.
Regeneration of village forests by using natural force with polymers and clay.
Evolving verification tests in Iitate village, etc., Fukushima. Expectation for prevention of recontamination of living area.In order to gently regenerate village forests without destroying forest ecosystem, a new technology for migration control of radioactive cesium has been developed. By scattering bentonite that adsorbs cesium on slope grounds covered by leaf soil, the uptake of cesium to plants is suppressed. The bentonite adsorbing cesium is transferred by rainwater flow and then captured by interpolyelectrolyte complex (self-assembly of polyelectrolytes having opposite charge by electrostatic interaction).
Patent-pending
press2016.3.14
Large-scale nuclear-structure calculation for constraining the masses of neutrinos using the K supercomputer
Yutaka Utsuno etc
Research Group for Heavy Element Nuclear Science
Discovery of a novel principle of generating spin currents from insulators under light illuminationOn the basis of large-scale nuclear-structure calculations using the K supercomputer, the most reliable value of the nuclear matrix element for neutrinoless ββ decay in Ca-48 is provided by a collaboration group among the University of Tokyo, Japan Atomic Energy Agency, and other institutes. This data will strongly narrow the range of neutrino masses when the neutrinoless ββ decay in Ca-48 is observed.
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press2016.3.7
Interface structure between graphene and metal substrate revealed by total-reflection high-energy positron diffraction (TRHEPD)
Yuki Fukaya etc
Research Group for Nanoscale Structure and Function of Advanced Materials
Discovery of a novel principle of generating spin currents from insulators under light illuminationCollaborative research team of JAEA and KEK experimentally verified using total-reflection high-energy positron diffraction (TRHEPD) that the spacing between graphene and metal substrate depends on the substrate material.
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press2016.2.24
Surface structure determination of TiO2 photocatalyst using total-reflection high-energy positron diffraction (TRHEPD)
Yuki Fukaya etc
Research Group for Nanoscale Structure and Function of Advanced Materials
Discovery of a novel principle of generating spin currents from insulators under light illuminationCollaborative research team of KEK, Hokkaido University, and JAEA experimentally determined the surface structure of TiO2 photocatalyst using total-reflection high-energy positron diffraction (TRHEPD)
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explain2015.12.2
Our research got featured in News&Views of Nature Physics and Nature Materials.
Spin-energy Transformation Science
Our latest research achievement "Electrical generation from quantum mechanical spinning motion in a liquid metal", press released on November 03, 2015, was featured in News&Views of Nature Physics and Nature Materials.
Nature Materials
Nature Physics
press2015.11.25
Nuclear charge symmetry breaking by a "strange particle" observed at J-PARC Hadron Experimental Facility
Hiroyuki SAKO etc
Research Group for Hadron Nuclear Physics
Discovery of a novel principle of generating spin currents from insulators under light illumination An international collaboration led by Tohoku University, High Energy Accelerator Research Organization (KEK), and Japan Atomic Energy Agency (JAEA) found fundamental symmetry called "charge symmetry" is broken by adding a "strange" particle, Lambda, to a nucleus in an experiment at J-PARC Hadron Experimental Facility.
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press2015.11.6
 Strong Suppression of the Spin Hall Effect in the Spin Glass State
Sadamichi MAEKAWA(Director) etc
 Strong Suppression of the Spin Hall Effect in the Spin Glass StateIn spin glass metals, where localized moments are polarized in random directions, the relative dynamics between the localized moment and the conduction electron spin is successfully probed by the spin Hall effect. Such spin dynamics is very difficult to be detected even by the superconducting quantum interference device (SQUID), the most sensitive magnetometer at the present stage. Such technique can be applied to develop the highly sensitive magnetic sensors.
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press2015.11.3
Electrical generation from quantum mechanical spinning motion in a liquid metal
Mamoru MATSUO etc
Spin-energy Transformation Science
Electrical generation from quantum mechanical spinning motion in a liquid metalThe team found a new method of power generation by using electron spinning motion in a liquid metal via the quantum mechanical coupling between electron and fluid vorticity. The result can be used as an electric generator and a spin generator in, e.g., micro-electromechanical system free from magnetic fields.
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press2015.9.28
Development of synthesis process of novel composite nanotubes using ion irradiation technique
Hidehito Asaoka etc
Research Coordination and Promotion Office
Discovery of a novel principle of generating spin currents from insulators under light illumination We have succeeded the development of synthesis process of novel composite nanotubes, which are consisted of different crystal states or new microstructures, using ion irradiation technique.
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press2015.5.18
Observation of giant spin-Hall effect mediated by quasiparticles in a superconductor
Sadamichi Maekawa etc
Research Group for Spin-Energy Transformation Science
Discovery of a novel principle of generating spin currents from insulators under light illumination・First demonstration of the spin-Hall effect in a superconductor. ・More than 2000 times enhancement of the effect has been achieved compared to the normal conductor case. ・This finding opens the door to next-generation spintronics devices such as a "spin-meter" that magnifies and detects tiny spin signals.
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press2015.5.15
Novel mechanism of superconductivity induced by strong magnetic field
Yo TOKUNAGA
R.G. for Materials Physics for Heavy Element Systems
Discovery of a novel principle of generating spin currents from insulators under light illuminationReentrant superconducitivity has been discovered in uranium based compound URhG under strong magnetic fields. We have revealed the noevel mechansim of this exotic phenomenon by means of Nuclear Magnetic Resonance (NMR) technique.
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press2015.4.9
Measurement of the first ionization potential of lawrencium (element 103) - Unravelling Relativistic Effects in the Heaviest Actinide Element -
Tetsuya K. Sato et al.
R. G. of Heavy Element Nuclear Science
Measurement of the first ionization potential of lawrencium (element 103)
- Unravelling Relativistic Effects in the Heaviest Actinide Element -We report that the experimentally obtained the first ionization potencial of the heaviest actinide, lawrencium (Lr, atomic number 103), is 4.96 eV. The value was measured with Lr-256 (half-life 27 seconds) using an efficient surface ion-source and a radioisotope detection system coupled to a mass separator at the JAEA tandem accelerator. The measured ionization potencial is in excellent agreement with the value predicted here by state-of-the-art relativistic calculations.
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press2015.3.12
The Newest Nuclear Decay Data in Hands – Completion of a comprehensive portable nuclear decay data map, “JAEA Chart of the Nuclides 2014” –
Hiroyuki KOURA etc
R.G. for Reactions Involving Heavy Nuclei
The Newest Nuclear Decay Data in Hands – Completion of a comprehensive portable nuclear decay data map, “JAEA Chart of the Nuclides 2014” –We have constructed a folding (A4-size) nuclear chart, “JAEA Chart of the Nuclides 2014,” including the latest experimental (3,150 points) and theoretical (1,578 points) decay data for nuclear science experts and the general public.
press2015.1.8
Discovery of a novel principle of generating spin currents from insulators under light illumination
Sadamichi MAEKAWA(Director General) etc
Research Group for Condensed Matter Theory
Discovery of a novel principle of generating spin currents from insulators under light illuminationA conversion of light energy into spin currents in magnetic insulators is demonstrated for the first time with the aid of "surface plasmon", a collective excitation of electrons in metal nanoparticles under light illumination.
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press2014.12.19
Transformation between electric- and spin-currents in metals
Sadamichi MAEKAWA(Director General) etc
Research Group for Condensed Matter Theory
Observation of colossal thermomagnetic response due to superconducting fluctuationWe have theoretically shown that electron-electron correlation is necessary to reproduce the experimental results of the spin Hall effect in Ir-doped Cu.
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press2014.12.12
Change of heat current by magnetic field: Possibility of heat control by magnet
Sadamichi MAEKAWA(Director General) etc
Research Group for Condensed Matter Theory
Observation of colossal thermomagnetic response due to superconducting fluctuationConcerning the phonon Hall effect, it has not been clarified the mechanism why a heat current is changed by a magnetic field. We theoretically show that this effect is due to resonant skew scattering of phonons from a tiny amout of magentic impurities.
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press2014.12.2
Observation of colossal thermomagnetic response due to superconducting fluctuation
Yoshinori HAGA etc
R.G. for Actinide Materials Science
Observation of colossal thermomagnetic response due to superconducting fluctuationThermomagnetic effect was investigated on an ultra-clean single crystal of a uranium superconductor URu2Si2. Colossal thermomagnetic response a million times larger than the theoretical prediction has successfully been detected. This observation proofs the superconducting fluctuation in this material.
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press2014.11.14
Efficient method developed for radioactive cesium recovery from sewage sludge ashes
Naofumi Kozai etc
Research Group for Bioactinides Chemistry
Efficient method developed for radioactive cesium recovery from sewage sludge ashesWe have revealed the chemical states of radioactive cesium in the sewage sludge ashes produced after the Fukushima Daiichi nuclear power plant accident and have succeeded in recovering more than 90 % of radioactive cesium in the ashes by pre-pulverizing the ashes to particles less than 1 µm and heating them in acid solutions.
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press2014.9.22
Mottled electrons condensation induced by magnetic field. -Development of heavy element new materials controlled by magnetic field-
Shinsaku KAMBE etc
R.G. for condensed matter physics of heavy element systems
Shinsaku KAMBE
Mottled electronic state is found in an Yb-based compound around a magnetic field induced quantum critical phase transition at low temperatures.
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press2014.9.19
Succesfully synthesis and detection of a Seaborgium (element 106) carbonyl complex - Seaborgium shows a typical chemical property of the group six in the periodic table of the elements -
Masato Asai etc
Research Group for the Superheavy Elements
Succesfully synthesis and detection of a Seaborgium (element 106) carbonyl complex - Seaborgium shows a typical chemical property of the group six in the periodic table of the elements -For the first time, a chemical bond was established between a superheavy element – seaborgium (element 106) in the present study – and a carbon atom by an international collaboration with research groups from Univ. Mainz, GSI and RIKEN. Seaborgium were converted into seaborgium hexacarbonyl complexes. Its gaseous properties and adsorption to a silicon dioxide surface were studied, and compared with similar compounds of neighbors of seaborgium in the same group of the periodic table.
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press2014.8.7
Development of a Novel Spectroscopic Technique to Observe Synergy Effect of Water with Radiation in the DNA Damage Processes
Akinari Yokoya, Ph.D. etc
Research Group for Radiation and Biomolecular Science
Succesfully synthesis and detection of a Seaborgium (element 106) carbonyl complex - Seaborgium shows a typical chemical property of the group six in the periodic table of the elements -
We have developed an novel spectroscopic technique, using high brilliant X-rays provided by SPring-8, to study synergy effect of radiation and water on the processes of DNA damage induced by radiation.
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press2014.7.22
Succses in developing a nanoglanuler material that shows giant dielectric and magnetoelectric responses at room temperature - Creation of a new multifanctional material -
Sadamichi MAEKAWA(Director General) etc
 
Succesfully synthesis and detection of a Seaborgium (element 106) carbonyl complex - Seaborgium shows a typical chemical property of the group six in the periodic table of the elements -
The newly developmed material is a thin-film dielectric material consists of metal and insulator phases, in which nano-magnetic particles have been dispersed in a inslator matrix. This so-called nanogranular material shows giant dielectric and magnetoelectric responses at room temperature.
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press2014.6.27
New phenomenon of magnetism in uranium ferromagnetic superconductors : To solve the mechanism for the co-existence of the magnetism and superconductivity
Naoyuki Tateiwa etc
Research group for actinide material science
Succesfully synthesis and detection of a Seaborgium (element 106) carbonyl complex - Seaborgium shows a typical chemical property of the group six in the periodic table of the elements -
We have found new phenomenon of magnetism in uranium ferromagnetic superconductors UGe2 and URhGe where the ferromagnetism and superconductivity co-exist.
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press2014.6.19
Direct observation of the 'hidden order': a longstanding mystery in solid state physics
Yoshinori HAGA etc
R.G. for Actinide Material Science
Succesfully synthesis and detection of a Seaborgium (element 106) carbonyl complex - Seaborgium shows a typical chemical property of the group six in the periodic table of the elements -
Deformation of the crystal lattice was detected in the hidden-order phase of URu2Si2 by using an ultra high-resolution crystallography with synchrotron radiation at SPring-8.
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press2014.6.12
Nuclear magnetic resonance study of uranium compound URu2Si2 by the world's strongest magnetic field
Hironori Sakai etc
Research Group for Condensed Matter Physics of Heavy Element Systems
Succesfully synthesis and detection of a Seaborgium (element 106) carbonyl complex - Seaborgium shows a typical chemical property of the group six in the periodic table of the elements -
An unknown magnetic structure in uranium compound URu2Si2 induced by high field over 35 tesla, has been determined by means of nuclear magnetic resonance technique. The experiment was performed using the world's strongest magnetic field in National High Magnetic Field Laboratory (NHMFL) in Tallahasee, USA.
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press2014.5.26
New human eyes for seeing thorough materials -Development on non-destructive light elemental analysis for extraterrestrial materials using a muon beam-
Wataru Higemoto etc
R.G. for condensed matter physics of heavy element systems
Succesfully synthesis and detection of a Seaborgium (element 106) carbonyl complex - Seaborgium shows a typical chemical property of the group six in the periodic table of the elements -
By using the most intense pulsed muon beam at J-PARC MUSE(MUon Science Establishment), we successfully demonstrate a depth-profile analysis of light elements (B, C, N, and O) from several mm-thick layered materials and non-destructive bulk analyses of meteorites containing organic materials.
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press2014.5.21
Success in observation of nucler spin controled by rotation
Hiroyuki CHUDO etc
R.G. for Spin Manipulation and Material Design by Combining Spintronics and High-Speed Rotation Technique
Succesfully synthesis and detection of a Seaborgium (element 106) carbonyl complex - Seaborgium shows a typical chemical property of the group six in the periodic table of the elements -
We have developed a unique conceptual measurement system of nucler spin of materials in rotoational speed of 10000 times per 1second based on nuclear magnetic resonance method.
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prize2014.4.15
Total reflection positron diffraction and its applications to surface study
Atsuo Kawasuso etc
Group Leader of spin-polarized positon beam research group
Total reflection positron diffraction and its applications to surface study
2014, Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology
Kawasuso, Group Leader, and his colaborators received the above award.
press2014.4.21
Improvement of total reflection positron diffraction realized ultimate surface structure analysis
Atsuo Kawasuso etc
Spin-polarized positon beam research group
Succesfully synthesis and detection of a Seaborgium (element 106) carbonyl complex - Seaborgium shows a typical chemical property of the group six in the periodic table of the elements -
We improved the total reflection positron diffraction method by enhancing the brightness of positron beam at KEK slow positon facility.
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press2014.4.18
DNA damage affects normal chromosomes in a living cell - A step in advance for the radiobiologicall effect-
Ayumi Urushibara, Ph.D. etc
Post doctrral fellow of JAEA (Present position: Visiting Scientist of Osaka prefecture Univ.)
Succesfully synthesis and detection of a Seaborgium (element 106) carbonyl complex - Seaborgium shows a typical chemical property of the group six in the periodic table of the elements -
We found that radiation damage to DNA could affect non-irradiated normal chromosomes to induce genetic instability. This project has been perfomed by collaboration with Prof. Seiji Kodama in Osaka prefectrue univ. (Pregident: Taketoshi Okuno)
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prize2014.4.17
20th gold medal prize, "discovery of electric spin curent fandamentals"
 
 
This prize is one of the prestigious prize in Science for Japanese scientist. Yomiuri Tchno Forum selects luminary scientists 3 or so per a year.
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